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Yuanheng International Co., Ltd.

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BrandLeici
OriginShanghai, China
Manufacturer TypeAuthorized Distributor
Origin CategoryDomestic (China)
ModelJPBJ-609L
Instrument TypeField-Portable
Measurement PrinciplePolarographic Electrochemical Sensor
Measurement Range0.00–50.00 mg/L
Accuracy±0.10 mg/L
DisplayHigh-Resolution Color TFT Touchscreen
Language SupportEnglish & Chinese
Temperature Units°C / °F
IP RatingIP65
Temperature CompensationAutomatic/Manual
Atmospheric Pressure CompensationkPa, mbar, Torr, atm (manual selection)
Salinity CompensationManual
Calibration ModesZero-Oxygen and Full-Scale (100% air-saturated)
Data Storage Capacity1000 measurement records
ConnectivityUSB 2.0, Bluetooth 4.2, U Disk interface, QR code scanner compatible
Power SupplyRechargeable Li-ion battery (USB-C charging support), PC/mobile power bank compatible
GLP ComplianceYes — full audit trail, user authentication, timestamped records
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BrandYoke
OriginShanghai, China
Modeli-403
Measurement ParameterspH (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)
AccuracypH ±0.01, Conductivity ±0.5% FS, DO ±0.2 mg/L
RepeatabilitypH ≤±0.01, Conductivity ≤±0.2% FS, DO ≤±0.1 mg/L
Detection LimitsConductivity 0.01 µS/cm, DO 0.01 mg/L
Display7-inch color capacitive touchscreen
ComplianceIP54 rated enclosure, GMP-compliant data handling with audit trail support
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BrandDELEITE
OriginShanghai, China
ModelPDO-J10T
Instrument TypePortable
Measurement PrincipleElectrochemical Probe — Clark-type Polarographic
DO Range0.00–20.00 mg/L (ppm)
DO Saturation Range0.0–200.0%
Temperature Range0.0–100.0 °C
DO Accuracy (Meter)±0.10 mg/L
(System w/ Probe)±0.40 mg/L
Saturation Accuracy±2.0% FS
Temperature Accuracy±0.1 °C
Barometric Pressure Accuracy±2%
DO Resolution0.01/0.1 mg/L
Saturation Resolution0.1%
Temperature Resolution0.1 °C
Response Time (90%)≤30 s at 25 °C
Stability±0.07 mg/L per hour
Data Storage Capacity2000 datasets (internal)
CompensationsAutomatic temperature, manual salinity (0–45 ppt), manual barometric pressure (0–200 kPa)
IP RatingIP54
PowerRechargeable 3.7 V / 1800 mAh Li-ion battery
Dimensions & Weight160 × 190 × 70 mm / 880 g
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BrandYSI
OriginUSA
ModelProSolo
Instrument TypePortable
Measurement PrincipleFluorescence-based Optical Sensing
DO Range0–50 mg/L (0–500% air saturation)
DO Accuracy±0.1 mg/L
DO Repeatability≤±0.5%
Temperature Range–5 to 70 °C
Temperature Accuracy±0.2 °C
Ingress ProtectionIP67
Battery LifeUp to 48 h (rechargeable Li-ion)
Data Storage>100,000 readings
Calibration Records400 entries
ComplianceEPA-approved method for BOD testing
Cable Options1–100 m (standard: 4 m)
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BrandWTW
OriginShanghai, China
Manufacturer TypeAuthorized Distributor
Product OriginDomestic (China-assembled under WTW/Xylem specifications)
ModelStirrOx® G
Instrument TypePortable DO Sensor
Measurement PrinciplePolarographic (Clark-type) Electrochemical Probe
Range0.00–90 mg/L O₂
Accuracy±0.5% of reading
Repeatability≤±0.5%
Detection Limit0.01 mg/L
Response Time (t₉₀)<60 s (in stirred water at 20 °C)
Operating Temperature0–40 °C
Membrane MaterialPTFE
ElectrolyteKCl-based aqueous solution
ConnectorWTW-standard 6-pin DIN
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BrandYoke
OriginShanghai, China
ModelL-201
Instrument TypePortable
Measurement PrinciplePotentiometric (Glass Electrode)
pH Range−2.00 to 20.00 pH
pH Resolution0.1 / 0.01 pH
pH Accuracy±0.01 pH
mV Range±1999.9 mV
mV Resolution0.1 mV
mV Accuracy±1 mV
pH Repeatability≤±0.01 pH
mV Repeatability≤±1 mV
Temperature CompensationAutomatic & Manual
Calibration Options1–3 point, with auto-buffer recognition
Built-in Buffers15 standard buffers across 3 groups
Display7-inch color TFT capacitive touchscreen
Language SupportEnglish & Chinese
User InterfaceGraphical, glove-compatible, UV-resistant, scratch-resistant, auto-dimming
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BrandYoke
OriginShanghai, China
Modeli-503
Measurement PrinciplesPotentiometric (pH/mV), Conductometric (EC/TDS/Salinity/Resistivity), Fluorescence-based Optical Dissolved Oxygen (DO)
pH Range0.00–14.00
EC Range0.00–200.0 mS/cm
DO Range0.00–99.00 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 Limit0.01 μS/cm
DO Detection Limit0.01 mg/L
Display7-inch color capacitive touchscreen
Protection RatingIP54
PowerRechargeable Li-ion battery with USB-C and external power input
ConnectivityIntegrated Bluetooth 5.0, USB data export, PC/mobile app support
ComplianceDesigned for GLP/GMP-aligned workflows with audit-trail-capable data logging, firmware upgradability, and factory reset capability
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BrandYoke
OriginShanghai, China
Modeli-501
Instrument TypePortable
Measurement PrincipleFluorescence Quenching (Optical)
DO Range0–50.00 mg/L
Accuracy±0.1 mg/L
Repeatability≤±0.05 mg/L
Detection Limit0.01 mg/L
Display7-inch color capacitive touchscreen
DO Resolution0.01 mg/L (at <10 mg/L), 0.1 mg/L (at ≥10 mg/L)
Temperature CompensationAutomatic & Manual
IP RatingIP54
Data ManagementOnboard statistics, audit trail, firmware update, power-fail recovery, factory reset
ComplianceDesigned for GLP/GMP-aligned workflows
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BrandYoke
OriginShanghai, China
ModelL-241
Instrument TypePortable
Measurement PrinciplesPotentiometric (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 Range0.00–99.00 mg/L
Dissolved Oxygen Accuracy±0.2 mg/L
Dissolved Oxygen Detection Limit0.01 mg/L
Conductivity Range0.00 µS/cm–200.0 mS/cm
Conductivity Accuracy±0.5% FS
Conductivity Detection Limit0.01 µS/cm
Temperature Range−5.0 to 55.0 °C
Temperature Accuracy±0.2 °C
IP RatingIP54
Display7-inch color TFT capacitive touchscreen
Data ManagementOnboard statistical analysis, timestamped storage, export via USB, GLP-compliant audit trail support
CalibrationAuto-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
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BrandYoke
OriginShanghai, China
ModelM907
Instrument TypePortable
Measurement PrincipleFluorescence Quenching
DO Range0–99.00 mg/L
DO Detection Limit0.01 mg/L
DO Accuracy±0.5% of reading (ion concentration)
Repeatability≤±0.2%
Display7-inch color capacitive touchscreen
pH/pX Range−2.00 to 20.00
pH/pX Resolution0.01 (default), selectable to 0.001 or 0.1
mV Range−1999.9 to +1999.9 mV
mV Resolution0.1 mV (selectable to 0.01 or 1)
Temperature CompensationAutomatic/manual with integrated high-stability temperature electrode
Data ManagementGLP-compliant storage, audit trail, method recall, USB/printer/PC connectivity
Enclosure RatingIP54
Ion ModesDirect concentration, standard addition, sample addition, Gran plot
Supported IonsH⁺, Ag⁺, Na⁺, K⁺, NH₄⁺, Cl⁻, F⁻, and user-definable
Unitsmg/L, g/L, mol/L, pX
Calibration TrackingAuto-log with expiry alert
StirringIntegrated magnetic stirrer
Endpoint DetectionConfigurable stability criteria
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BrandWTW
OriginGermany
ModelOxi 7310
Instrument TypeBenchtop Laboratory DO Meter
Measurement PrincipleElectrochemical (Clark-type Polarographic Sensor)
Range0.00–20.00 mg/L
Accuracy±0.5% of reading (0.00–20.00 mg/L)
Repeatability≤±0.5%
Detection Limit0.10 mg/L
Temperature Range−5.0 to +105.0 °C (±0.1 °C)
Saturation Range0.0–200.0 % (±0.5%) and 0.0–600 % (±0.5%)
Partial Pressure Range0–200.0 hPa / 0–1250 hPa
Data Storage500 manual entries / 5000 auto-logged records
InterfaceMicro-USB
GLP ComplianceYes (time-stamped, user-ID, probe serial logging, audit-ready CSV export)
Power Supply4×AA alkaline or NiMH batteries or AC adapter
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BrandYoke
OriginShanghai, China
Manufacturer TypeAuthorized Distributor
Product CategoryDomestic
ModelL-501 (Fluorescence Method)
Instrument TypePortable
Measurement PrincipleFluorescence Quenching
Measurement Range0–99.00 mg/L
Accuracy±0.1 mg/L
Repeatability≤±0.05 mg/L
Detection Limit0.01 mg/L
Display7-inch Color Touchscreen
Parameters DisplayedDO Concentration (mg/L), Saturation (%), Temperature (°C/°F)
Temperature CompensationAutomatic & Manual
Electrode Status MonitoringIntelligent Diagnostic Algorithm
Sensor DesignSolid-State Fluorescent Cap, No Electrolyte, No Polarization Required
Cap ReplacementTool-Free, Quick-Swap Mechanism
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BrandYoke
OriginShanghai, China
ModelL-341
Instrument TypePortable
Measurement PrinciplesPotentiometric (pH/mV), Galvanic Cell (Dissolved Oxygen), Conductivity Bridge (Conductivity/TDS/Salinity/Resistivity)
pH Range0.00–14.00
pH Accuracy±0.01
pH Repeatability≤±0.01
Conductivity Range0.000 μS/cm – 2000 mS/cm
Conductivity Accuracy±0.5% FS
Conductivity Repeatability≤±0.2%
Conductivity Detection Limit0.01 μS/cm
Dissolved Oxygen Range0.00–50.00 mg/L
Dissolved Oxygen Accuracy±0.2 mg/L
Dissolved Oxygen Repeatability≤±0.1 mg/L
Dissolved Oxygen Detection Limit0.01 mg/L
Temperature CompensationAutomatic & Manual
Display7-inch TFT color touchscreen
IP RatingIP54
ComplianceSupports GMP data integrity requirements (audit trail, user access control, data export, firmware update log)
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BrandYoke
OriginShanghai, China
ModelL-401
Instrument TypePortable
Measurement PrincipleFluorescence Quenching
Range0.00–99.00 mg/L
Accuracy±0.2 mg/L
Repeatability≤±0.1 mg/L
Detection Limit0.01 mg/L
Display7-inch capacitive touchscreen
Resolution0.01/0.1 mg/L
Temperature CompensationAutomatic and manual modes supported
Language OptionsEnglish and Chinese UI
Unitsmg/L and % saturation selectable
Operating Temperature0–50 °C (standard ambient range for field-portable DO meters)
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BrandLeici
OriginShanghai, China
ModelJPBJ-608
Instrument TypePortable
Measurement PrinciplePolarographic Electrochemical Probe
Measurement Range(0.00–50.00) mg/L
Accuracy±0.30 mg/L for values ≤20.00 mg/L
IP RatingIP65
Data Storage Capacity500 measurement sets
Temperature CompensationAutomatic (user-selectable units: °C or °F)
Atmospheric Pressure CompensationAutomatic (kPa, mmHg, atm selectable)
CalibrationZero-oxygen and saturated-oxygen (full-scale) calibration supported
Salt CompensationManual input
ConnectivityRS-232 printer port, USB interface for PC communication
Power SupplyRechargeable lithium-ion battery with low-voltage and charging-status indicators
BacklightAdjustable
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BrandYoke
OriginShanghai, China
ModelL-503
Instrument TypeBenchtop Laboratory Analyzer
Measurement PrinciplespH (glass electrode), Conductivity (4-electrode AC conductivity), Dissolved Oxygen (fluorescence quenching), Temperature (Pt1000 RTD)
pH Range0.00–14.00
pH Accuracy±0.01 pH
pH Repeatability≤±0.01 pH
Conductivity Range0.000 µS/cm–2000 mS/cm
Conductivity Accuracy±0.5% FS
Conductivity Detection Limit0.01 µS/cm
DO Range0.00–99.00 mg/L
DO Accuracy±0.2 mg/L
DO Repeatability≤±0.1 mg/L
DO Detection Limit0.01 mg/L
Temperature Range–5.0 to 55.0 °C
Temperature Accuracy±0.2 °C
Display7-inch capacitive color touchscreen (1024×600)
IP RatingIP54
Data StorageInternal memory for ≥2000 datasets with timestamp, operator ID, and audit trail metadata
ComplianceSupports GLP/GMP data integrity requirements including user-defined access levels, electronic signature readiness, and calibration history logging
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BrandYoke
OriginShanghai, China
ModelM902
Instrument TypePortable
Measurement PrincipleFluorescence-based Dissolved Oxygen (Note: *Correction required — device is a conductivity meter
Conductivity Range0.000 μS/cm to 2000 mS/cm
Accuracy±0.5% FS (Conductivity)
Repeatability≤ ±0.2%
Detection Limit0.01 μS/cm
Display7-inch color capacitive touchscreen
Temperature CompensationAutomatic/manual with integrated high-stability temperature electrode
IP RatingIP54
Data ComplianceGLP-compliant audit trail, calibration history logging, method recall, USB/printer/computer connectivity
CalibrationMulti-point (1–5 points), auto-standard recognition, calibration expiry alert
Sample HandlingBuilt-in magnetic stirrer, endpoint stability criteria configurable
Environmental ProtectionDust and splash resistant (IP54)
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BrandLeici
OriginShanghai, China
Manufacturer TypeAuthorized Distributor
Region of ManufactureDomestic (China)
ModelJPSJ-606T
Instrument TypeBenchtop Laboratory Meter
Measurement PrincipleElectrochemical Probe — Clark-type Polarographic Sensor
Measurement Range (Electronic Unit)0.00–99.99 mg/L
Accuracy±0.10 mg/L
Repeatability±2.0%
DisplayHigh-resolution color LCD touchscreen
Language SupportEnglish & Chinese
Temperature Units°C or °F
Included AccessoriesPolarographic DO electrode, independent electrode stand, dust cover
CalibrationZero-oxygen and saturation (air-saturated water) calibration
CompensationAutomatic temperature compensation (ATC), manual or automatic atmospheric pressure compensation (kPa, mbar, Torr, atm), manual salinity compensation
Endpoint DetectionIntelligent endpoint recognition with auto-read, timed-read, interval-read, and manual-read modes
Data ManagementGLP-compliant storage for 1000 measurement records with timestamp, electrode ID, calibration history, user ID, and environmental parameters
Security & ComplianceUser-level access control (admin/operator), password protection, GMP audit trail (operation log with user, action, timestamp), full traceability
ConnectivityRS-232 (for thermal/serial printers), USB-B (PC communication via dedicated software), U-disk read/write, barcode scanner support
Optional AutomationCompatible with automated sample changers for unattended batch analysis
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BrandLeici
OriginShanghai, China
Instrument TypeLaboratory Benchtop DO Meter
Measurement PrinciplePolarographic Electrochemical Probe
Measurement Range0–90.00 mg/L
Accuracy±0.10 mg/L
Repeatability≤0.15 mg/L
Detection Limit±0.10 mg/L (at 0 mg/L)
Temperature CompensationAutomatic (NTC sensor integrated)
Atmospheric Pressure CompensationBuilt-in barometric sensor
Calibration ModesZero-oxygen (sodium sulfite), Full-scale (air-saturated water or Winkler standard), Salt Correction Support
ConnectivityRS-232, USB port for PC and USB flash drive
Data Storage1000 measurement records with timestamp, electrode ID, calibration history, user ID, and environmental parameters
GLP ComplianceYes — full audit trail including calibration logs, user login events, and data modification timestamps
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BrandYSI
OriginUSA
ModelPRO1020
Measurement ParametersTemperature, pH, Dissolved Oxygen (DO)
DO MethodPolarographic (Clark-type) or Galvanic Cell (user-selectable)
DO Range0–50 mg/L (0–500% air saturation)
pH Range0–14
pH Resolution0.01
pH Accuracy±0.2
Temperature Range–5 to +55 °C
Temperature Accuracy±0.2 °C
ORP Range–1500 to +1500 mV
ORP Accuracy±20 mV
DO Resolution0.01 or 0.1 mg/L (selectable)
DO Accuracy±2% or ±0.2 mg/L (0–20 mg/L), ±6% (20–50 mg/L)
Data Storage50 measurement sets
DisplayBacklit LCD with dual backlight (screen + keypad)
Enclosure RatingIP67
Dimensions8.3 × 21.6 × 2.3 cm
Weight475 g (with batteries)
PowerTwo AA alkaline batteries
Cable Options1 m / 4 m / 10 m / 20 m / 30 m detachable cables
ConnectorMIL-spec waterproof quick-disconnect
Probe HousingStainless steel protective sleeve
Battery CompartmentIndependently sealed from electronics
Bend Endurance≥300,000 cable flex cycles
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BrandYoke
OriginShanghai, China
ModelL-403
Instrument TypeBenchtop Laboratory Analyzer
Measurement PrinciplesPotentiometric (pH/mV), Conductometric (Conductivity/TDS/Salinity/Resistivity), Polarographic (Dissolved Oxygen)
pH Range0.00–20.00 pH
pH Accuracy±0.01 pH
pH Resolution0.001 / 0.01 / 0.1 pH (selectable)
mV Range±2000.0 mV
mV Accuracy±0.2 mV
mV Resolution0.01 / 0.1 / 1 mV (selectable)
Conductivity Range0.01 μS/cm – 100 mS/cm
Conductivity Accuracy±1% FS
Conductivity Detection Limit0.01 μS/cm
Dissolved Oxygen Range0.00–20.00 mg/L
DO Accuracy±0.1 mg/L
DO Detection Limit0.01 mg/L
DO Saturation Range0.0–200.0%
Temperature Range0–50 °C
Temp. Accuracy±0.2 °C
Repeatability≤±0.5%
Data StorageUp to 2000 datasets with timestamp, operator ID, and metadata
Calibration OptionsAuto-buffer recognition (15 built-in standards), 1–3 point pH calibration, single-point conductivity calibration (8 preloaded standard solutions), DO zero & span calibration
ComplianceIP54-rated enclosure
Software FeaturesStatistical analysis (mean, SD, min/max), audit trail (GMP-compliant), firmware update via USB, auto-diagnostic reporting, power-fail recovery
Operating SystemDual-language (English/Chinese), adjustable screen brightness & time format, configurable temperature units (°C/°F)
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BrandYoke
OriginShanghai, China
ModelM901
Instrument TypePortable
Measurement PrincipleFluorescence Quenching (DO), Potentiometric (pH)
DO Range0–99.00 mg/L
pH Accuracy±0.002
mV Accuracy±0.1 mV
pH Repeatability≤±0.001
mV Repeatability≤±0.1 mV
pH Range−2.00 to 20.00
pH Resolution0.001
mV Resolution0.1 mV
Display7-inch color capacitive touchscreen
IP RatingIP54
Temperature CompensationAutomatic/manual with integrated high-stability temperature electrode
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BrandYoke
OriginShanghai, China
Modeli-701
Instrument TypePortable
Measurement PrinciplePotentiometric (Ion-Selective Electrode, ISE)
pH Range–2.00 to 20.00 pH/pX
mV Range–1999.9 to +1999.9 mV
pH Resolution0.01 pH (selectable down to 0.001 pH)
mV Resolution0.1 mV (selectable down to 0.01 mV)
AccuracypH ±0.01 pH
Repeatability≤±0.5%
Detection Limit0.01 mg/L
Temperature CompensationAutomatic & Manual
IP RatingIP54
ComplianceGMP-aligned data integrity features
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BrandWTW
OriginGermany
ModelOxi 3310
Instrument TypePortable
Measurement PrincipleElectrochemical Clark-type Polarographic Sensor
DO Range0.00–19.99 mg/L (extended range up to 90 mg/L)
Accuracy±0.5% of reading
Saturation Range0.0–199.9% (extended to 600%)
Partial Pressure Range0–199.9 hPa / 0–1250 hPa
Temperature Range−5.0 to +105.0 °C (±0.1 °C)
Data Storage200 manual + 5,000 automatic records
IP RatingIP66/IP67
Power Supply4 × 1.5 V alkaline or 4 × 1.2 V rechargeable batteries
Battery Lifeup to 1000 h (150 h with backlight enabled)
InterfaceWaterproof USB 2.0
CalibrationAutomatic timer-based OxiCal protocol with CellOx/DurOx probes
Temperature CompensationATC (Automatic Temperature Compensation)
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