Dissolved Oxygen Meter
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| Brand | Leici |
|---|---|
| Origin | Shanghai, China |
| Model | JPBJ-608 |
| Instrument Type | Portable |
| Measurement Principle | Polarographic Electrochemical Probe |
| Measurement Range | (0.00–50.00) mg/L |
| Accuracy | ±0.30 mg/L for values ≤20.00 mg/L |
| IP Rating | IP65 |
| Data Storage Capacity | 500 measurement sets |
| Temperature Compensation | Automatic (user-selectable units: °C or °F) |
| Atmospheric Pressure Compensation | Automatic (kPa, mmHg, atm selectable) |
| Calibration | Zero-oxygen and saturated-oxygen (full-scale) calibration supported |
| Salt Compensation | Manual input |
| Connectivity | RS-232 printer port, USB interface for PC communication |
| Power Supply | Rechargeable lithium-ion battery with low-voltage and charging-status indicators |
| Backlight | Adjustable |
| Brand | Leici |
|---|---|
| Origin | Shanghai, China |
| Manufacturer Type | Direct Manufacturer |
| Regional Classification | Domestic (China) |
| Model | JPBJ-608 |
| Instrument Type | Portable |
| Measurement Principle | Electrochemical Probe — Clark-type Polarographic Sensor |
| DO Range | (0.00–50.00) mg/L |
| Accuracy | ±0.30 mg/L for ≤20.00 mg/L |
| Resolution | 0.01 mg/L (DO), 0.1 °C / 0.1 °F (Temperature), 0.1% (Saturation) |
| Response Time | ≤45 s (90% response at 20.0 °C) |
| Temperature Compensation | Automatic, with manual salinity compensation |
| Atmospheric Pressure Compensation | kPa, mmHg, atm selectable |
| IP Rating | IP65 |
| Data Storage | 500 sets |
| Power | Rechargeable Li-ion battery |
| Dimensions | 80 × 225 × 35 mm |
| Weight | 0.4 kg |
| Compliance | GLP-compliant data logging with audit trail support |
| Brand | Leici |
|---|---|
| Origin | Shanghai, China |
| Manufacturer Type | Authorized Distributor |
| Origin Category | Domestic (China) |
| Model | JPBJ-609L |
| Instrument Type | Field-Portable |
| Measurement Principle | Polarographic Electrochemical Sensor |
| Measurement Range | 0.00–50.00 mg/L |
| Accuracy | ±0.10 mg/L |
| Display | High-Resolution Color TFT Touchscreen |
| Language Support | English & Chinese |
| Temperature Units | °C / °F |
| IP Rating | IP65 |
| Temperature Compensation | Automatic/Manual |
| Atmospheric Pressure Compensation | kPa, mbar, Torr, atm (manual selection) |
| Salinity Compensation | Manual |
| Calibration Modes | Zero-Oxygen and Full-Scale (100% air-saturated) |
| Data Storage Capacity | 1000 measurement records |
| Connectivity | USB 2.0, Bluetooth 4.2, U Disk interface, QR code scanner compatible |
| Power Supply | Rechargeable Li-ion battery (USB-C charging support), PC/mobile power bank compatible |
| GLP Compliance | Yes — full audit trail, user authentication, timestamped records |
| Brand | Leici |
|---|---|
| Origin | Shanghai, China |
| Manufacturer Type | Manufacturer |
| Country of Origin | China |
| Model | JPBJ-609L |
| Instrument Type | Portable |
| Measurement Principle | Electrochemical Clark-type Polarographic Probe |
| Measurement Range | (0.00–50.00) mg/L |
| Accuracy | ±0.10 mg/L (0.00–50.00 mg/L) |
| Resolution | 0.01 mg/L |
| Response Time | ≤45 s (90% response at 20 °C) |
| Temperature Compensation | Automatic/Manual (−10.0 to 135.0 °C) |
| Atmospheric Pressure Compensation | Manual (kPa, mbar, Torr, atm) |
| Salinity Compensation | Manual |
| IP Rating | IP65 |
| Battery | Rechargeable Li-ion |
| Dimensions | 90 × 255 × 40 mm |
| Weight | 0.5 kg |
| Brand | Leici |
|---|---|
| Origin | Shanghai, China |
| Manufacturer Type | Direct Manufacturer |
| Regional Classification | Domestic (China) |
| Model | JPBJ-611Y |
| Instrument Type | Portable |
| Measurement Principle | Fluorescence Quenching |
| Measurement Range | (0.00–20.00) mg/L DO |
| Accuracy | ±0.30 mg/L |
| Resolution | 0.01 mg/L (DO), 0.1% (Saturation), 0.1 °C (Temperature) |
| Temperature Compensation | Automatic (0.0–50.0 °C) |
| Salinity Compensation | Manual (0.0–50.0 g/L) |
| Atmospheric Pressure Compensation | Automatic (50.0–110.0 kPa) |
| Power Supply | Rechargeable Li-ion Battery |
| Dimensions | 235 × 90 × 56 mm |
| Weight | ~0.3 kg |
| Data Storage Capacity | 1000 datasets with metadata (location, timestamp, operator ID, section ID, calibration logs) |
| Display | 3.5″ TFT Touchscreen |
| Standard Electrode | DO-962 Optical DO Sensor |
| Brand | Leici |
|---|---|
| Origin | Shanghai, China |
| Instrument Type | Laboratory Benchtop DO Meter |
| Measurement Principle | Polarographic Electrochemical Probe |
| Measurement Range | 0–90.00 mg/L |
| Accuracy | ±0.10 mg/L |
| Repeatability | ≤0.15 mg/L |
| Detection Limit | ±0.10 mg/L (at 0 mg/L) |
| Temperature Compensation | Automatic (NTC sensor integrated) |
| Atmospheric Pressure Compensation | Built-in barometric sensor |
| Calibration Modes | Zero-oxygen (sodium sulfite), Full-scale (air-saturated water or Winkler standard), Salt Correction Support |
| Connectivity | RS-232, USB port for PC and USB flash drive |
| Data Storage | 1000 measurement records with timestamp, electrode ID, calibration history, user ID, and environmental parameters |
| GLP Compliance | Yes — full audit trail including calibration logs, user login events, and data modification timestamps |
| Brand | Leici |
|---|---|
| Origin | Shanghai, China |
| Manufacturer Type | Authorized Distributor |
| Region of Manufacture | Domestic (China) |
| Model | JPSJ-606T |
| Instrument Type | Benchtop Laboratory Meter |
| Measurement Principle | Electrochemical Probe — Clark-type Polarographic Sensor |
| Measurement Range (Electronic Unit) | 0.00–99.99 mg/L |
| Accuracy | ±0.10 mg/L |
| Repeatability | ±2.0% |
| Display | High-resolution color LCD touchscreen |
| Language Support | English & Chinese |
| Temperature Units | °C or °F |
| Included Accessories | Polarographic DO electrode, independent electrode stand, dust cover |
| Calibration | Zero-oxygen and saturation (air-saturated water) calibration |
| Compensation | Automatic temperature compensation (ATC), manual or automatic atmospheric pressure compensation (kPa, mbar, Torr, atm), manual salinity compensation |
| Endpoint Detection | Intelligent endpoint recognition with auto-read, timed-read, interval-read, and manual-read modes |
| Data Management | GLP-compliant storage for 1000 measurement records with timestamp, electrode ID, calibration history, user ID, and environmental parameters |
| Security & Compliance | User-level access control (admin/operator), password protection, GMP audit trail (operation log with user, action, timestamp), full traceability |
| Connectivity | RS-232 (for thermal/serial printers), USB-B (PC communication via dedicated software), U-disk read/write, barcode scanner support |
| Optional Automation | Compatible with automated sample changers for unattended batch analysis |
| Brand | Leici |
|---|---|
| Origin | Shanghai, China |
| Manufacturer Type | Direct Manufacturer |
| Regional Classification | Domestic (China) |
| Model | JPSJ-606T |
| Price Range | USD 700–1,400 |
| Instrument Type | Laboratory Benchtop |
| Measurement Principle | Polarographic Electrochemical Probe |
| Dissolved Oxygen Range (Electronic Unit) | 0.00–99.99 mg/L |
| Accuracy | ±0.10 mg/L (0.00–50.00 mg/L) |
| Instrument Accuracy | ±0.30 mg/L (≤20.00 mg/L) |
| Repeatability | ±2.0% |
| Response Time | ≤45 s (90% response at 20.0 °C) |
| Temperature Compensation | Automatic |
| Atmospheric Pressure Compensation | Manual or Auto (kPa, mbar, Torr, atm) |
| Salinity Compensation | Manual |
| Saturation Range | 0.0–600.0 % |
| Temperature Range | −10.0–135.0 °C |
| Temperature Accuracy | ±0.3 °C (0.0–60.0 °C) |
| Data Storage Capacity | 1,000 datasets |
| Connectivity | RS-232, USB, optional LIMS integration |
| Compliance | GLP, GMP-ready audit trail support |
| IP Rating | IP54 |
| Power Supply | AC 100–240 V → DC 24 V adapter |
| Dimensions & Weight | 220 × 195 × 68 mm, 0.95 kg |
| Brand | Mettler Toledo |
|---|---|
| Model | FG4 |
| Measurement Principle | Galvanic Cell (Self-Polarizing) |
| Temperature Compensation | Automatic (NTC 30 kΩ) |
| Atmospheric Pressure Compensation | Manual or Optional Barometric Sensor Input |
| Salinity Compensation | Manual Input (0–70 g/L) |
| Display | Backlit LCD with Electrode Status Indicator |
| Power Supply | 4 × AA Batteries (incl.) |
| IP Rating | IP67 |
| Operating Temperature | 0–50 °C |
| Storage Temperature | –25–70 °C |
| Compliance | CE, RoHS, ISO 5814 (Dissolved Oxygen — Electrochemical Probe Method) |
| Electrode Compatibility | LE611 (Standard), LE612 (Ruggedized) |
| Data Output | None (Standalone Unit) |
| Calibration | 1-point Air Saturation or 2-point (Air + Zero Solution) |
| Units | mg/L, % saturation, ppm, µmol/L |
| Resolution | 0.01 mg/L (DO), 0.1 °C (Temp) |
| Accuracy | ±0.2 mg/L (0–20 mg/L), ±0.5 °C (Temperature) |
| Brand | METTLER TOLEDO |
|---|---|
| Origin | Switzerland |
| Type | Online DO Analyzer |
| Measurement Principle | Optical Luminescence Quenching (ISO 5814:2012 compliant) |
| Range | 0.00–80.00 mg/L (0– saturation, 0–50 ppm, 0–50,000 ppb) |
| Accuracy | ±0.2 mg/L at 25°C |
| Repeatability | ≤0.05% of reading |
| Detection Limit | <2 ppb (in high-purity water mode) |
| Sensor Technology | ISM® (Intelligent Sensor Management) enabled |
| Compliance | FDA 21 CFR Part 11 ready, USP <1231>, ASTM D888, ISO 5814, EN 25814 |
| Brand | METTLER TOLEDO |
|---|---|
| Origin | Switzerland |
| Model | S4, S9 |
| Portability | Portable |
| Measurement Principle | Polarographic (Clark-type) or Optical (Luminescence-based) — configurable per probe |
| Measurement Range | 0.00–50.0 mg/L (ppm) |
| Accuracy | ±0.1 mg/L (0–8 mg/L), ±0.2 mg/L (8–20 mg/L), ±10% (20–50 mg/L) |
| Repeatability | ±0.05% of reading |
| Detection Limit | ±2 ppb (O₂ in water) |
| Ingress Protection | IP67 |
| Electrode Compatibility | ISM® (Intelligent Sensor Management) enabled |
| Data Interface | Waterproof USB (IP67-rated) |
| Display | High-contrast, sunlight-readable LCD with StatusLight™ indicator |
| Language Support | 12 languages including English, German, French, Spanish, Chinese, Japanese, Korean, etc. |
| Brand | METTLER TOLEDO |
|---|---|
| Origin | Shanghai, China |
| Manufacturer Type | Authorized Distributor |
| Product Category | Domestic (China-manufactured) |
| Model | SG9 |
| Instrument Type | Laboratory-Portable |
| IP Rating | IP67 |
| Measurement Principle | Optical Luminescence (RDO® Technology) |
| DO Range | 0.00–80.00 mg/L (ppm) |
| Resolution | 0.01 mg/L |
| Accuracy | ±0.1 mg/L (0–8 mg/L), ±0.2 mg/L (8–20 mg/L), ±10% (20–80 mg/L) |
| Saturation Range | 0.0–50.0% |
| Saturation Resolution | 0.1% |
| Barometric Pressure Range | 500–1100 mbar |
| Pressure Resolution | 0.1 mbar |
| Data Storage | 500 GLP-compliant records |
| Calibration Management | ISM® Intelligent Sensor Management |
| Sensor Interface | Digital ISM-enabled OptiOx probe |
| Communication | Infrared (IR) interface |
| Operating Modes | Standard / Expert |
| Endpoint Options | Auto, Manual, Timed |
| Compliance | GLP, ISO/IEC 17025-supporting workflows, FDA 21 CFR Part 11-ready (with optional software) |
| Brand | VELP |
|---|---|
| Origin | Italy |
| Model | BOD10 |
| Instrument Type | Laboratory |
| Measurement Principle | Pressure-based Respirometric Method (Mercury-Free Electronic Transducer) |
| Measurement Ranges | 90, 250, 600, 999 mg/L BOD₅ |
| Data Logging Interval | 24 h (5-point profile over standard 5-day incubation) |
| Operating Duration | Configurable from 1 to 28 days |
| Power Supply | Dual Lithium-Ion Batteries (2-year service life) |
| Safety Rating | IEC 61010-1 Class III |
| Ingress Protection | IP54 per EN 60529 |
| Operating Temperature | −20 °C to +65 °C |
| Weight | 80 g |
| Enclosure Material | Stainless Steel (316) with Chemical-Resistant Coating |
| Sample Capacity | Simultaneous monitoring of up to 10 samples (BOD Sensor System 10 configuration) |
| Alarm Function | Automatic out-of-range alert |
| Compliance | ASTM D5210, ISO 5815-1:2019, APHA 5210B, EU Directive 2000/60/EC (Water Framework Directive) |
| Brand | VELP |
|---|---|
| Origin | Italy |
| Model | FTC90 Series |
| Internal Volume | 64 L / 196 L |
| Temperature Range | 3–50 °C |
| Temperature Control Accuracy | ±0.5 °C |
| Temperature Resolution | 0.1 °C |
| Control System | Microprocessor-based PID control with forced-air circulation |
| Data Logging | PC connectivity via RS232/USB, compatible with VELP专用 software for time-temperature profiling and programmable cycles |
| Power Consumption | 350 W |
| Compliance | Designed for ISO 5815-1:2017, ISO 5815-2:2017, and APHA Standard Methods 5210B (BOD₅) |
| Brand | WTW |
|---|---|
| Origin | Germany |
| Model | FDO 925 |
| Instrument Type | Portable |
| Measurement Principle | Optical Fluorescence Quenching |
| Range | 0–20 mg/L DO |
| Accuracy | ±0.5% of reading ±0.05 mg/L DO |
| Repeatability | ≤0.1% of reading |
| Detection Limit | 0.01 mg/L DO |
| Response Time (t₉₀) | <30 s |
| Temperature Range | 0–50 °C |
| IP Rating | IP68 (2.5 bar) |
| Cable Options | 1.5 / 3 / 6 / 25 m |
| Electrode Body Material | POM |
| Cap Material | PVC, silicone, PMMA |
| Temperature Sensor | Integrated NTC30 (30 kΩ at 25 °C) |
| Weight | 180 g (with 3 m cable) |
| Brand | WTW |
|---|---|
| Origin | Germany |
| Model | Oxi 7310 |
| Instrument Type | Benchtop Laboratory DO Meter |
| Measurement Principle | Electrochemical (Clark-type Polarographic Sensor) |
| Range | 0.00–20.00 mg/L |
| Accuracy | ±0.5% of reading (0.00–20.00 mg/L) |
| Repeatability | ≤±0.5% |
| Detection Limit | 0.10 mg/L |
| Temperature Range | −5.0 to +105.0 °C (±0.1 °C) |
| Saturation Range | 0.0–200.0 % (±0.5%) and 0.0–600 % (±0.5%) |
| Partial Pressure Range | 0–200.0 hPa / 0–1250 hPa |
| Data Storage | 500 manual entries / 5000 auto-logged records |
| Interface | Micro-USB |
| GLP Compliance | Yes (time-stamped, user-ID, probe serial logging, audit-ready CSV export) |
| Power Supply | 4×AA alkaline or NiMH batteries or AC adapter |
| Brand | WTW |
|---|---|
| Model | Oxi 3310 |
| Type | Portable |
| Measurement Principle | Galvanic Cell Electrochemical Probe |
| Range | 0.00–19.99 mg/L (conc.), up to 90 mg/L (extended) |
| Accuracy | ±0.5% of reading |
| Repeatability | 0.05% |
| Detection Limit | 0.01 ppb |
| Temperature Range | –5.0 to 105.0 °C (±0.1 °C) |
| Auto-Temperature Compensation (ATC) | Yes |
| Calibration | 1–5-point, automatic recognition of 16 DIN/NIST buffers |
| Data Storage | 5000 automatic + 200 manual entries |
| IP Rating | IP66/IP67 |
| Battery Life | Up to 1000 h (display off), 150 h (backlight on) |
| Interface | Waterproof USB |
| Built-in Barometric Pressure Sensor | Yes |
| Brand | WTW |
|---|---|
| Origin | Germany |
| Model | Oxi 3310 |
| Instrument Type | Portable |
| Measurement Principle | Electrochemical Clark-type Polarographic Probe |
| DO Range | 0.00–19.99 mg/L (extended up to 90 mg/L) |
| Accuracy | ±0.5% of reading |
| Saturation Range | 0.0–199.9% (extended up to 600%) |
| Partial Pressure Range | 0–199.9 hPa / 0–1250 hPa |
| Temperature Range | −5.0 to +105.0 °C |
| Temp. Accuracy | ±0.1 °C |
| Data Storage | 200 manual + 5000 auto-log entries |
| Logging Interval | 1 s – 60 min |
| IP Rating | IP66/IP67 |
| Power Supply | 4 × 1.5 V alkaline or 4 × 1.2 V rechargeable batteries |
| Battery Life | up to 1000 h (150 h with backlight enabled) |
| Interface | Waterproof USB |
| Calibration | Automatic OxiCal protocol with electrode status feedback |
| ATC | Integrated automatic temperature compensation |
| CMC | Continuous Measurement Control with real-time validity indication |
| Brand | WTW |
|---|---|
| Origin | Germany |
| Model | Oxi 3310 |
| Instrument Type | Portable |
| Measurement Principle | Electrochemical Clark-type Polarographic Sensor |
| DO Range | 0.00–19.99 mg/L (extended range up to 90 mg/L) |
| Accuracy | ±0.5% of reading |
| Saturation Range | 0.0–199.9% (extended to 600%) |
| Partial Pressure Range | 0–199.9 hPa / 0–1250 hPa |
| Temperature Range | −5.0 to +105.0 °C (±0.1 °C) |
| Data Storage | 200 manual + 5,000 automatic records |
| IP Rating | IP66/IP67 |
| Power Supply | 4 × 1.5 V alkaline or 4 × 1.2 V rechargeable batteries |
| Battery Life | up to 1000 h (150 h with backlight enabled) |
| Interface | Waterproof USB 2.0 |
| Calibration | Automatic timer-based OxiCal protocol with CellOx/DurOx probes |
| Temperature Compensation | ATC (Automatic Temperature Compensation) |
| Brand | WTW |
|---|---|
| Origin | Shanghai, China |
| Manufacturer Type | Authorized Distributor |
| Product Origin | Domestic (China-assembled under WTW/Xylem specifications) |
| Model | StirrOx® G |
| Instrument Type | Portable DO Sensor |
| Measurement Principle | Polarographic (Clark-type) Electrochemical Probe |
| Range | 0.00–90 mg/L O₂ |
| Accuracy | ±0.5% of reading |
| Repeatability | ≤±0.5% |
| Detection Limit | 0.01 mg/L |
| Response Time (t₉₀) | <60 s (in stirred water at 20 °C) |
| Operating Temperature | 0–40 °C |
| Membrane Material | PTFE |
| Electrolyte | KCl-based aqueous solution |
| Connector | WTW-standard 6-pin DIN |
| Brand | Yoke |
|---|---|
| Origin | Shanghai, China |
| Model | i-231 |
| Instrument Type | Portable |
| Measurement Principles | Potentiometric (pH/mV), Conductometric (Conductivity/TDS/Salinity/Resistivity), Electrochemical (Galvanic or Polarographic Dissolved Oxygen) |
| pH Range | 0.00–14.00 |
| pH Accuracy | ±0.01 |
| pH Repeatability | ≤±0.01 |
| Conductivity Range | 0.000 μS/cm – 2000 mS/cm |
| Conductivity Accuracy | ±0.5% FS |
| Conductivity Repeatability | ≤±0.2% |
| Conductivity Detection Limit | 0.01 μS/cm |
| Dissolved Oxygen Range | 0.00–99.00 mg/L |
| DO Accuracy | ±0.2 mg/L |
| DO Repeatability | ≤±0.1 mg/L |
| DO Detection Limit | 0.01 mg/L |
| Temperature Compensation | Automatic & Manual |
| IP Rating | IP54 |
| Display | 7-inch full-color capacitive touchscreen |
| Data Management | Onboard storage, statistical analysis, audit-trail-capable export, GMP-compliant operation |
| Brand | Yoke |
|---|---|
| Origin | Shanghai, China |
| Model | i-403 |
| Measurement Parameters | pH (0.00–14.00), Conductivity (0.000 µS/cm–200 mS/cm), Dissolved Oxygen (0.00–99.00 mg/L), Temperature (−5.0–55.0 °C) |
| Accuracy | pH ±0.01, Conductivity ±0.5% FS, DO ±0.2 mg/L |
| Repeatability | pH ≤±0.01, Conductivity ≤±0.2% FS, DO ≤±0.1 mg/L |
| Detection Limits | Conductivity 0.01 µS/cm, DO 0.01 mg/L |
| Display | 7-inch color capacitive touchscreen |
| Compliance | IP54 rated enclosure, GMP-compliant data handling with audit trail support |
| Brand | Yoke |
|---|---|
| Origin | Shanghai, China |
| Model | i-501 |
| Instrument Type | Portable |
| Measurement Principle | Fluorescence Quenching (Optical) |
| DO Range | 0–50.00 mg/L |
| Accuracy | ±0.1 mg/L |
| Repeatability | ≤±0.05 mg/L |
| Detection Limit | 0.01 mg/L |
| Display | 7-inch color capacitive touchscreen |
| DO Resolution | 0.01 mg/L (at <10 mg/L), 0.1 mg/L (at ≥10 mg/L) |
| Temperature Compensation | Automatic & Manual |
| IP Rating | IP54 |
| Data Management | Onboard statistics, audit trail, firmware update, power-fail recovery, factory reset |
| Compliance | Designed for GLP/GMP-aligned workflows |
| Brand | Yoke |
|---|---|
| Origin | Shanghai, China |
| Model | i-503 |
| Measurement Principles | Potentiometric (pH/mV), Conductometric (EC/TDS/Salinity/Resistivity), Fluorescence-based Optical Dissolved Oxygen (DO) |
| pH Range | 0.00–14.00 |
| EC Range | 0.00–200.0 mS/cm |
| DO Range | 0.00–99.00 mg/L |
| Temperature Range | −5.0–55.0 °C |
| pH Accuracy | ±0.01 pH |
| EC Accuracy | ±0.5% FS |
| DO Accuracy | ±0.2 mg/L |
| pH Repeatability | ≤±0.01 pH |
| EC Repeatability | ≤±0.2% |
| DO Repeatability | ≤±0.1 mg/L |
| EC Detection Limit | 0.01 μS/cm |
| DO Detection Limit | 0.01 mg/L |
| Display | 7-inch color capacitive touchscreen |
| Protection Rating | IP54 |
| Power | Rechargeable Li-ion battery with USB-C and external power input |
| Connectivity | Integrated Bluetooth 5.0, USB data export, PC/mobile app support |
| Compliance | Designed for GLP/GMP-aligned workflows with audit-trail-capable data logging, firmware upgradability, and factory reset capability |
| Brand | Yoke |
|---|---|
| Origin | Shanghai, China |
| Model | i-701 |
| Instrument Type | Portable |
| Measurement Principle | Potentiometric (Ion-Selective Electrode, ISE) |
| pH Range | –2.00 to 20.00 pH/pX |
| mV Range | –1999.9 to +1999.9 mV |
| pH Resolution | 0.01 pH (selectable down to 0.001 pH) |
| mV Resolution | 0.1 mV (selectable down to 0.01 mV) |
| Accuracy | pH ±0.01 pH |
| Repeatability | ≤±0.5% |
| Detection Limit | 0.01 mg/L |
| Temperature Compensation | Automatic & Manual |
| IP Rating | IP54 |
| Compliance | GMP-aligned data integrity features |
| Brand | Yoke |
|---|---|
| Origin | Shanghai, China |
| Model | L-201 |
| Instrument Type | Portable |
| Measurement Principle | Potentiometric (Glass Electrode) |
| pH Range | −2.00 to 20.00 pH |
| pH Resolution | 0.1 / 0.01 pH |
| pH Accuracy | ±0.01 pH |
| mV Range | ±1999.9 mV |
| mV Resolution | 0.1 mV |
| mV Accuracy | ±1 mV |
| pH Repeatability | ≤±0.01 pH |
| mV Repeatability | ≤±1 mV |
| Temperature Compensation | Automatic & Manual |
| Calibration Options | 1–3 point, with auto-buffer recognition |
| Built-in Buffers | 15 standard buffers across 3 groups |
| Display | 7-inch color TFT capacitive touchscreen |
| Language Support | English & Chinese |
| User Interface | Graphical, glove-compatible, UV-resistant, scratch-resistant, auto-dimming |
| Brand | Yoke |
|---|---|
| Origin | Shanghai, China |
| Model | L-231 |
| Instrument Type | Portable |
| Measurement Principle | Fluorescence-based Dissolved Oxygen (DO), Potentiometric pH, Conductivity (4-electrode or 2-electrode, selectable) |
| DO Range | 0–99.00 mg/L |
| DO Accuracy | ±0.2 mg/L |
| DO Detection Limit | 0.01 mg/L |
| pH Accuracy | ±0.01 pH |
| pH Range | −2.00 to 20.00 pH |
| pH Resolution | 0.001 / 0.01 / 0.1 pH (user-selectable) |
| mV Resolution | 0.01 / 0.1 / 1 mV (user-selectable) |
| Conductivity Accuracy | ±0.5% FS |
| Conductivity Detection Limit | 0.01 µS/cm |
| Conductivity Calibration | Built-in 8 standard solutions (ISO/ASTM-compliant), 1-point user calibration supported |
| Repeatability | DO ≤ ±0.1 mg/L |
| Temperature Compensation | Automatic (NTC 30kΩ) and manual modes |
| Data Management | Onboard statistical analysis (min/max/avg/stdev), audit-trail-capable storage, GLP/GMP-compliant data logging with timestamp, user ID, and electrode status metadata |
| Enclosure Rating | IP54 |
| Display | 7-inch capacitive color touchscreen with glove-compatible operation, UV-resistant, scratch-resistant surface, adjustable brightness and auto-dimming |
| Power | Rechargeable Li-ion battery (≥16 h continuous use), AC adapter included |
| Compliance | Meets ISO 5814 (DO by optical method), ASTM D888, USP <643>, and relevant Chinese national standards (e.g., HJ 506-2009 for DO |
| Brand | Yoke |
|---|---|
| Origin | Shanghai, China |
| Model | L-241 |
| Instrument Type | Portable |
| Measurement Principles | Potentiometric (pH/mV), Electrochemical Polarographic (Dissolved Oxygen), Conductometric (Conductivity) |
| pH Range | −2.00 to 20.00 pH |
| pH Accuracy | ±0.01 pH |
| pH Repeatability | ≤±0.01 pH |
| Dissolved Oxygen Range | 0.00–99.00 mg/L |
| Dissolved Oxygen Accuracy | ±0.2 mg/L |
| Dissolved Oxygen Detection Limit | 0.01 mg/L |
| Conductivity Range | 0.00 µS/cm–200.0 mS/cm |
| Conductivity Accuracy | ±0.5% FS |
| Conductivity Detection Limit | 0.01 µS/cm |
| Temperature Range | −5.0 to 55.0 °C |
| Temperature Accuracy | ±0.2 °C |
| IP Rating | IP54 |
| Display | 7-inch color TFT capacitive touchscreen |
| Data Management | Onboard statistical analysis, timestamped storage, export via USB, GLP-compliant audit trail support |
| Calibration | Auto-buffer recognition (15 built-in buffers across 3 groups), 1–3-point user-defined pH calibration with slope & status display, automatic DO salinity & atmospheric pressure compensation, ATC/MTC |
| Brand | Yoke |
|---|---|
| Origin | Shanghai, China |
| Model | L-301 |
| Instrument Type | Portable |
| Measurement Principle | Fluorescence-based DO detection & Potentiometric pH measurement |
| pH Range | -2.00 to 20.00 |
| pH Resolution | 0.001 / 0.01 / 0.1 pH (user-selectable) |
| mV Resolution | 0.1 / 0.1 / 1 mV (user-selectable) |
| DO Range | 0.00–99.00 mg/L |
| pH Accuracy | ±0.02 pH |
| mV Accuracy | ±1 mV |
| pH Repeatability | ≤±0.01 pH |
| mV Repeatability | ≤±1 mV |
| Temperature Compensation | Automatic and manual modes |
| Calibration | Up to 3-point pH calibration with auto-buffer recognition |
| Display | 7-inch full-color capacitive touchscreen |
| Language Support | English and Chinese |
| Environmental Protection | UV-resistant, scratch-resistant, glove-compatible surface |
| Power | Rechargeable Li-ion battery (operating time ≥12 h typical) |
| Compliance | Designed for field and lab use per ISO 5667-3, ASTM D3693, and USP <781> water quality testing protocols |
| Brand | Yoke |
|---|---|
| Origin | Shanghai, China |
| Model | L-341 |
| Instrument Type | Portable |
| Measurement Principles | Potentiometric (pH/mV), Galvanic Cell (Dissolved Oxygen), Conductivity Bridge (Conductivity/TDS/Salinity/Resistivity) |
| pH Range | 0.00–14.00 |
| pH Accuracy | ±0.01 |
| pH Repeatability | ≤±0.01 |
| Conductivity Range | 0.000 μS/cm – 2000 mS/cm |
| Conductivity Accuracy | ±0.5% FS |
| Conductivity Repeatability | ≤±0.2% |
| Conductivity Detection Limit | 0.01 μS/cm |
| Dissolved Oxygen Range | 0.00–50.00 mg/L |
| Dissolved Oxygen Accuracy | ±0.2 mg/L |
| Dissolved Oxygen Repeatability | ≤±0.1 mg/L |
| Dissolved Oxygen Detection Limit | 0.01 mg/L |
| Temperature Compensation | Automatic & Manual |
| Display | 7-inch TFT color touchscreen |
| IP Rating | IP54 |
| Compliance | Supports GMP data integrity requirements (audit trail, user access control, data export, firmware update log) |