Environmental Monitoring Instruments
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| Brand | Youyunpu |
|---|---|
| Origin | Shandong, China |
| Manufacturer Type | Direct Manufacturer |
| Product Category | Domestic |
| Model | YP-QA |
| Price | USD 1,800 (FOB) |
| Sampling Principle | Six-Stage Andersen-style Impaction |
| Flow Rate | 28.3 L/min (±5% accuracy) |
| Particle Size Resolution | 0.65–7.0 µm across six tiers |
| Collection Efficiency | ≥98% |
| Timer Range | 1–99 h (±1% accuracy) |
| Noise Level | ≤60 dB(A) |
| Power Supply | AC/DC dual-mode |
| Brand | Youyunpu |
|---|---|
| Origin | Shandong, China |
| Manufacturer Type | OEM/ODM Manufacturer |
| Country of Origin | China |
| Model | YP-S60 |
| Price | USD 1,200 (FOB Qingdao) |
| Measurement Principle | Spectrophotometry (Visible Light Absorption, 420–680 nm) |
| Measurable Parameters | pH, Dissolved Oxygen (DO), Ammonia-Nitrogen (NH₃-N), Nitrite (NO₂⁻), Hydrogen Sulfide (H₂S), Total Alkalinity, Phosphate (PO₄³⁻), Total Hardness, Free Chlorine, Temperature, Salinity |
| Resolution | 0.001 unit (pH, DO, Cl₂, etc.) |
| Optical Source | Imported Cold LED Light Source (Lifetime ≥ 100,000 h) |
| Power Supply | Rechargeable Li-ion Battery (DC 7.4 V, 4400 mAh) + AC Adapter (100–240 V, 50/60 Hz) |
| Operating Environment | 0–50 °C, RH ≤ 90% non-condensing |
| Compliance | ISO 7027 (turbidity reference), ASTM D1293 (pH), ASTM D888 (DO), EPA 365.3 (phosphate), EPA 350.1 (ammonia), USP <643> (conductivity-related calibration traceability) |
| Brand | Youyunpu |
|---|---|
| Origin | Shandong, China |
| Manufacturer Type | Direct Manufacturer |
| Model | YP-SY |
| Measurement Range | 0–500 µg/L |
| Resolution | 0.01 µg/L |
| Accuracy | ±5% of Rhodamine WT signal equivalent at 1 ppb |
| Linearity | R² > 0.999 |
| Sensor Material | SUS316L stainless steel |
| Host Material | ABS+PC blend |
| Host IP Rating | IP67 |
| Sensor IP Rating | IP68 |
| Operating Temperature | 0–50 °C (non-freezing) |
| Storage Temperature | −15–60 °C |
| Sensor Dimensions | Ø24 mm × 207 mm |
| Sensor Weight | <0.25 kg |
| Host Dimensions | 203 × 100 × 43 mm |
| Host Weight | 0.5 kg |
| Standard Cable Length | 3 m (extendable) |
| Display | 3.5-inch color LCD with adjustable backlight |
| Data Storage | 8 GB internal flash memory |
| Power | Rechargeable Li-ion battery, USB-C charging |
| Connectivity | Automatic sensor recognition and interface adaptation |
| Calibration & Configuration | On-device sensor parameter setup and two-point calibration support |
| Brand | Youyunpu |
|---|---|
| Origin | Shandong, China |
| Manufacturer Type | Direct Manufacturer |
| Country of Origin | China |
| Model | YP-SZA |
| Instrument Category | Automatic Water Sampler |
| Sampling Method | Flow-Proportional & Time-Proportional Sampling |
| Instrument Form Factor | Portable Water Sampler |
| Sampling Interval | 1–9999 min |
| Number of Sample Bottles | 12 |
| Sample Volume per Bottle | 10–1000 mL |
| Bottle Capacity | 1000 mL |
| Sampling Accuracy | ±10% (at 200 mL) |
| Flow-Proportional Accuracy | ±10% |
| Pump Suction Lift | ≥8 m |
| Horizontal Sampling Distance | ≥60 m |
| Sample Refrigeration Temperature | 0–4 °C (±1.5 °C) |
| System Air-Tightness | ≤−0.07 MPa |
| MTBF | ≥1440 h |
| Insulation Resistance | >20 MΩ |
| Analog Input | 4–20 mA |
| Digital Inputs | Switch Signal, RS485 |
| Power Supply | AC 220 V ±10%, 50 Hz ±1 Hz |
| Operating Temperature | 10–40 °C |
| Operating Humidity | ≤85% RH |
| Weight | 20 kg |
| Origin | Beijing, China |
|---|---|
| Manufacturer Type | Authorized Distributor |
| Origin Category | Domestic (China-made) |
| Model | YQ-580 |
| Pricing | Available Upon Request |
| Measurement Principle | Laser Backscatter Photometry |
| Output Signal | 4–20 mA (max. load 500 Ω) |
| Power Supply | DC 16–24 V ±10% |
| Power Consumption | ≤3 W |
| Dimensions | 160 × 160 × 250 mm |
| Weight | 4 kg |
| Operating Temperature | −40 °C to +65 °C |
| Relative Humidity | 0–100% RH |
| Measurement Range | 0–200 mg/m³ (standard), extendable to 0–10 g/m³ (custom configuration) |
| Detection Limit | 2 mg/m³ |
| Accuracy | ±2% FS |
| Maximum Stack Diameter | 15 m |
| Minimum Stack Diameter | 1 m |
| Max. Flue Gas Temperature | 300 °C (high-temp version available upon customization) |
| Installation | Single-ended, tool-free mechanical mounting |
| Compliance | Designed for continuous emission monitoring (CEMS) integration per GB/T 16157, HJ 75–2017, and compatible with ISO 12141, ASTM D6216, and EU BREF reference methods |
| Brand | Azure Cloud & Wind Confluence |
|---|---|
| Origin | Jiangsu, China |
| Manufacturer Type | Authorized Distributor |
| Country of Origin | China |
| Model | YS-ZS100 |
| Instrument Category | Soil Moisture and Water Potential Analyzer |
| Pricing | USD 700 (FOB Jiangsu) |
| Origin | USA |
|---|---|
| Manufacturer Type | Authorized Distributor |
| Origin Category | Imported |
| Model | YSI 30 / YSI 30M |
| Price | Upon Request |
| Conductivity Range | 0–499.9 µS/cm (0.1 µS/cm res., ±0.5% FS), 0–4999 µS/cm (1.0 µS/cm res., ±0.5% FS), 0–49.99 mS/cm (0.01 mS/cm res., ±0.5% FS), 0–200.0 mS/cm (0.1 mS/cm res., ±0.5% FS) |
| Salinity Range | 0–80 ppt (0.1 ppt res., ±2% or ±0.1 ppt) |
| Temperature Range | −5 to +95 °C (0.1 °C res., ±0.1 °C ±1 LSD) |
| Cell Constant | 5.0 cm⁻¹ ±4% |
| Reference Temperature | Adjustable between 15–25 °C |
| Temp. Compensation Coefficient | 0–4% (adjustable) |
| IP Rating | >IP65 |
| Power | 9 V DC (six AA alkaline batteries, ~100 h typical life) |
| Dimensions | 24.1 × 8.9 × 5.6 cm |
| Weight | 0.77 kg |
| Data Storage | 50 readings (YSI 30M only, non-volatile memory) |
| Origin | USA |
|---|---|
| Manufacturer Type | Authorized Distributor |
| Origin Category | Imported |
| Model | YSI 3100 |
| Price | Upon Request |
| Conductivity Range | 0–49.99 µS/cm (0.01 µS/cm res., ±0.50%), 0–499.9 µS/cm (0.1 µS/cm res., ±0.50%), 0–4999 µS/cm (1 µS/cm res., ±0.50%), 0–49.99 mS/cm (0.01 mS/cm res., ±0.50%), 0–499.9 mS/cm (0.01 mS/cm res., ±0.50%) |
| Salinity Range | 0–80 ppt (0.1 ppt res., ±0.1 ppt or 2%) |
| Temperature Range | −5 to +95 °C (0.1 °C res., ±0.1 °C + 1 LSD) |
| Temperature Compensation | Linear, adjustable reference temp. 15–25 °C, coefficient 0–4 %/°C |
| Cell Constants | 0.01, 0.1, 1.0, 10.0 cm⁻¹ |
| Calibration | Single-point |
| Display | LCD |
| Connector | 7-pin mini-DIN |
| Platinum Plating Function | Yes |
| Power Supply | 220 V AC |
| Certifications | UL, CSA, CE |
| Operating Humidity | Up to 95% RH (non-condensing) |
| Origin | USA |
|---|---|
| Manufacturer Type | Authorized Distributor |
| Origin Category | Imported |
| Model | YSI 3200 |
| Pricing | Upon Request |
| Brand | YSI |
|---|---|
| Origin | USA |
| Model | 4010-1W |
| DO Measurement Range | 0–60 mg/L |
| DO Accuracy | ≤ ±0.2 mg/L |
| DO Repeatability | ≤ ±0.1 mg/L |
| Response Time (90%) | ≤ 30 s |
| Operating Temperature | 0–50 °C |
| Power Supply | AC 100–240 V (wide-range input) |
| Resolution | 0.01 mg/L |
| DO Measurement Principle | Clark-type electrochemical polarographic sensor with integrated stirring |
| Compliance | ASTM D888, ISO 5814, USP <781>, EPA 450/4-85-001, HJ/T 99–2003, GB 11913–89, GB 7488–87 |
| Origin | USA |
|---|---|
| Manufacturer Type | Authorized Distributor |
| Origin Category | Imported |
| Model | YSI 5000 |
| Pricing | Upon Request |
| Brand | YSI |
|---|---|
| Origin | USA |
| Model | YSI 5000 |
| Compliance | HJ/T 99–2003, GB 7488–1987, GB 11913–1989 |
| Probe Type | Self-stirring electrochemical DO/BOD sensor (YSI 5906 membrane cap) |
| Data Storage | 100 timestamped readings |
| Software | Optional YSI BOD Analysis Software with automated calculation, report generation, and audit-ready export |
| Stirring | Integrated constant-speed magnetic stirrer |
| Membrane | Pre-tensioned 5906 polarographic membrane cap |
| Zero Drift | None – factory-calibrated, no user zero adjustment required |
| Alarm Functions | Supersaturation warning, temperature out-of-range alert, membrane integrity failure detection |
| Brand | YSI |
|---|---|
| Origin | USA |
| Model | YSI 5000 Series |
| Measurement Range | 0–60 mg/L DO / 0–600% air saturation |
| Temperature Range | –5 to +50 °C |
| Resolution | 0.01 mg/L / 0.1% air saturation / 0.1 °C |
| Accuracy | ±0.1% of reading + 1 LSD (DO and % saturation) / ±0.1 °C (temperature) |
| Salinity Compensation | up to 40 ppt |
| Data Storage | 100 timestamped readings with real-time clock |
| Interface | RS-232 |
| Power | 4 × D-cell alkaline batteries or 220 V AC adapter |
| Probe Power | Instrument-supplied (no external power required for YSI 5010/5015 probes) |
| Software Compatibility | YSI BOD Analysis Software (v5.1+), EPA Method 503-compliant OUR/SOUR calculation module (YSI 5100 only) |
| Built-in Barometer | Yes (YSI 5100 only) |
| Auto-Calibration | Yes (YSI 5100 only) |
| Barcode Scanner Support | Yes (YSI 5100 only) |
| Origin | USA |
|---|---|
| Manufacturer Type | Authorized Distributor |
| Origin Category | Imported |
| Model | YSI 55 / 55D |
| Price | Upon Request |
| Origin | USA |
|---|---|
| Manufacturer Type | Authorized Distributor |
| Origin Category | Imported |
| Model | YSI 550A |
| Pricing | Upon Request |
| Brand | YSI |
|---|---|
| Origin | USA |
| Model | YSI 550A |
| Instrument Type | Portable |
| IP Rating | IP67 |
| Measurement Principle | Polarographic (Clark-type) Electrode with Thermistor Temperature Compensation |
| DO Range | 0–50 mg/L (0–500% air saturation) |
| Temperature Range | –5 to +45 °C |
| DO Accuracy | ±2% or ±2% air saturation (0–200%), ±6% (200–500%) |
| Temp Accuracy | ±0.3 °C |
| Resolution | 0.01/0.1 mg/L (selectable), 0.1 °C, 0.1/1% air saturation (selectable) |
| Battery Life | Up to 2000 hours |
| Cable Options | 3.7 m, 7.5 m, 15 m, 30 m |
| Calibration | Built-in DO calibration chamber, automatic temperature compensation, manual salinity & altitude compensation |
| Brand | YSI |
|---|---|
| Origin | USA |
| Model | YSI 556MPS |
| Instrument Type | Portable Multiparameter Water Quality Analyzer |
| DO (Air Saturation) | 0–500%, Resolution: 0.1%, Accuracy: ±2% or ±2% air saturation (0–200%), ±6% (200–500%) |
| DO (mg/L) | 0–50 mg/L, Resolution: 0.01 mg/L, Accuracy: ±2% or ±0.2 mg/L (0–20 mg/L), ±6% (20–50 mg/L) |
| Temperature | −5 to +45 °C, Resolution: 0.1 °C, Accuracy: ±0.15 °C |
| Conductivity | 0–200 mS/cm, Resolution: 0.001–0.1 mS/cm (range-dependent), Accuracy: ±0.5% or ±0.001 mS/cm (4-m cable), ±1.0% or ±0.001 mS/cm (20-m cable) |
| Salinity | 0–70 ppt, Resolution: 0.01 ppt, Accuracy: ±1.0% or ±0.1 ppt |
| pH (optional) | 0–14, Resolution: 0.01, Accuracy: ±0.2 |
| ORP (optional) | −999 to +999 mV, Resolution: 0.1 mV, Accuracy: ±20 mV |
| TDS | 0–100 g/L, Resolution: 4-digit |
| Barometer (optional) | 500–800 mmHg, Resolution: 0.1 mmHg, Accuracy: ±3 mmHg (within ±15 °C of calibration temperature) |
| Origin | USA |
|---|---|
| Manufacturer Type | Authorized Distributor |
| Origin Category | Imported |
| Model | YSI 556MPS |
| Price | Upon Request |
| Brand | YSI |
|---|---|
| Origin | USA |
| Model | 556MPS |
| Dissolved Oxygen (DO) | 0–500% air saturation / 0–50 mg/L |
| Conductivity | 0–100 mS/cm |
| Salinity | 0–70 ppt |
| Temperature | −5 to 70 °C |
| pH | 0–14 |
| ORP | −999 to +999 mV |
| TDS | 0–100 g/L |
| Barometer (optional) | 500–800 mmHg |
| Accuracy (typical) | ±0.2 °C (temp), ±0.2 pH, ±2% FS (DO <200%), ±0.001 mS/cm (cond), ±0.1 ppt (salinity) |
| Memory | 49,000 data sets with timestamp |
| IP Rating | IP67 |
| Cable Options | 4 m, 10 m, 20 m |
| Power | 4 × C-cell alkaline or rechargeable batteries |
| Dimensions | 22.9 × 11.9 cm |
| Weight | 0.92 kg (with batteries) |
| Brand | YSI |
|---|---|
| Origin | USA |
| Model | YSI 58 |
| Type | Portable |
| Measurement Principle | Clark-type polarographic electrode |
| DO Range (mg/L) | 0–20 mg/L |
| DO Resolution (mg/L) | 0.01 mg/L |
| DO Accuracy (mg/L) | ±0.03 mg/L |
| DO Range (% air saturation) | 0–200% |
| DO Resolution (% sat) | 0.1% |
| DO Accuracy (% sat) | ±0.3% |
| Temperature Range | −5 to +45 °C |
| Temperature Resolution | 0.1 °C |
| Temperature Accuracy | ±0.3 °C |
| Temp Compensation Range | 0 to +45 °C |
| Salinity Compensation Range | 0–40 ppt |
| Salinity Compensation Accuracy | ±0.3% of compensated reading ±1 digit |
| Recorder Output | 0–1 V DC (0.5 V = 1 digit), ±0.4% full scale ±1 least significant digit, min. load 50 kΩ |
| Power | 4 × D-cell batteries (Zn-C or alkaline), ~1000 h life |
| Dimensions | 21.6 × 28.0 × 9.5 cm |
| Weight | 1.90 kg |
| Origin | USA |
|---|---|
| Manufacturer Type | Authorized Distributor |
| Origin Category | Imported |
| Model | YSI 60 |
| Price | Upon Request |
| Brand | YSI |
|---|---|
| Origin | USA |
| Model | 600XL / 600XLM |
| DO (Air Saturation) | 0–500%, ±2% (0–200%), ±6% of reading (200–500%) |
| DO (mg/L) | 0–50 mg/L, ±2 mg/L (0–20 mg/L), ±6% (20–50 mg/L) |
| Conductivity | 0–100 mS/cm, ±0.5% of reading + 0.001 mS/cm |
| Temperature | −5 to 50 °C, ±0.15 °C |
| pH | 0–14, ±0.2 |
| ORP | −999 to +999 mV, ±20 mV |
| Salinity | 0–70 ppt, ±1.0% or ±0.1 ppt (whichever is greater) |
| Depth (shallow) | 0–9 m, ±0.018 m |
| Depth (medium) | 0–61 m, ±0.12 m |
| Barometrically Compensated Water Level | 0–9 m, ±0.003 m |
| Data Storage | 150,000 readings (600XLM only) |
| Power | Internal battery (600XLM, up to 75 days at 1-hr interval) or external power (600XL & 600XLM) |
| Communication | SDI-12 compliant |
| Brand | YSI |
|---|---|
| Origin | USA |
| Model | 600XLM / 600XL |
| Power Options | Internal rechargeable battery (600XLM only) or external DC power (both models) |
| Data Storage Capacity | Up to 150,000 readings |
| Sampling Interval | User-programmable |
| Battery Life | Up to 75 days at 1-hour intervals (600XLM) |
| Depth Rating | Up to 61 m with optional detachable cable |
| Probe Diameter | ≤5 cm for well deployment |
| Sensor Interface | SDI-12 compliant |
| Compatible Display | YSI 650 MDS |
| Optional Accessories | YSI 5083 Flow Cell (groundwater), YSI 6200 Data Logger Platform |
| Measured Parameters | Temperature (°C), Dissolved Oxygen (% air saturation and mg/L), Conductivity (µS/cm), Specific Conductance (µS/cm @ 25°C), Salinity (ppt), pH (unitless), ORP (mV), Depth/Water Level (m), Total Dissolved Solids (mg/L), Resistivity (kΩ·cm) — TDS and resistivity calculated from conductivity and temperature |
| Brand | YSI |
|---|---|
| Origin | USA |
| Model | YSI 6600EDS |
| DO Range (sat.) | 0–500% (±2% or 2% sat., whichever greater, 0–200%) |
| DO Range (mg/L) | 0–50 mg/L (±2% or 0.2 mg/L, 0–20 mg/L) |
| Conductivity | 0–100 mS/cm (±0.5% + 0.001 mS/cm) |
| Temperature | −5 to 50 °C (±0.15 °C) |
| pH | 0–14 (±0.2) |
| ORP | −999 to +999 mV (±20 mV) |
| Salinity | 0–70 ppt (±1.0% or 0.1 ppt) |
| Depth (shallow/medium/deep) | 0–9 m (±0.018 m) / 0–61 m (±0.12 m) / 0–200 m (±0.3 m) |
| Barometric Pressure Compensated Water Level | 0–9 m (±0.003 m) |
| Turbidity | 0–1000 NTU (±2% or 0.3 NTU) |
| Chlorophyll-a | 0–400 µg/L (LOD: 0.1 µg/L |
| Rhodamine WT | 0–200 µg/L (±5% or 1.0 µg/L) |
| Brand | Xylem |
|---|---|
| Origin | USA |
| Model | YSI 6600V2 |
| Instrument Type | In-situ and Long-term Online Water Quality Analyzer |
| Sensor Configuration | Up to 4 Optical Sensors (Optical DO, BGA-Phycocyanin, BGA-Phycoerythrin, Chlorophyll-a, Turbidity, Rhodamine WT) |
| Measurement Principle | Fluorescence Lifetime (DO), In-vivo Fluorescence (Chlorophyll-a, BGA), Nephelometry (Turbidity), Fluorometric Tracer Detection (Rhodamine WT) |
| Operating Environment | Freshwater, Seawater, Wastewater |
| Temperature Range | -5 to 50 °C |
| Depth Rating | Up to 200 m (deep-water configuration) |
| Data Storage | 150,000 readings (non-volatile memory) |
| Power | Internal 8× C-cell alkaline batteries (54-day endurance at 15-min interval, 20 °C) or 12 V DC external supply |
| Communication | RS-232, SDI-12 |
| Housing Material | PVC |
| Weight | 3.18 kg (with battery and depth sensor) |
| Dimensions | Ø8.9 cm × 54.9 cm (with depth sensor) |
| Origin | USA |
|---|---|
| Manufacturer Type | Authorized Distributor |
| Origin Category | Imported |
| Model | YSI 6600V2 |
| Price | Upon Request |
| Brand | YSI |
|---|---|
| Origin | USA |
| Model | 6600V2 |
| Sensor Capacity | Up to 4 optical sensors (DO, phycocyanin/blue-green algae, turbidity, chlorophyll-a, rhodamine WT) |
| Measurement Principle | Fluorescence lifetime (ROX DO), optical absorption/scattering (turbidity, chlorophyll, BGA), fluorescence excitation/emission (rhodamine) |
| Operating Temperature | -5 to +50 °C |
| Storage Temperature | -10 to +60 °C |
| Housing Material | PVC |
| Communication Interfaces | RS-232, SDI-12 |
| Memory | 384 KB non-volatile memory (150,000 readings) |
| Power Supply | Internal: 8 × C-cell alkaline batteries (54 days @ 15-min interval, 20 °C) |
| External | 12 V DC |
| Dimensions | Ø 8.9 cm × 49.8 cm (without depth sensor), 54.9 cm (with depth sensor) |
| Weight | 3.18 kg (with batteries and depth sensor) |
| Water Compatibility | Freshwater, seawater, wastewater |
| Self-Cleaning | Integrated brush mechanism on all optical sensors |
| User-Replaceable Sensors | All except depth sensor |
| Brand | YSI |
|---|---|
| Origin | USA |
| Model | YSI 6600V2-2 |
| Depth Rating | 200 m |
| Dissolved Oxygen (DO) | 0–500% air saturation / 0–50 mg/L |
| Conductivity | 0–100 mS/cm |
| Temperature | −5 to 50 °C |
| pH | 0–14 |
| ORP | −999 to +999 mV |
| Salinity | 0–70 ppt |
| Turbidity | 0–1,000 NTU |
| Chlorophyll-a | 0–400 µg/L |
| Rhodamine WT | 0–200 µg/L |
| Ammonia-N & Nitrate-N | 0–200 mg N/L |
| Chloride | 0–1,000 mg/L |
| Memory Capacity | 150,000 readings |
| Battery Life | up to 90 days |
| Brand | YSI |
|---|---|
| Origin | USA |
| Model | 6820 / 6920 |
| Dissolved Oxygen (DO) | 0–500% air saturation (±2% or 2% of reading, whichever is greater, for 0–200% |
| Conductivity | 0–100 mS/cm (±0.5% + 0.001 mS/cm) |
| Temperature | −5 to 50 °C (±0.15 °C) |
| pH | 0–14 (±0.2) |
| ORP | −999 to +999 mV (±20 mV) |
| Salinity | 0–70 ppt (±1.0% or 0.1 ppt, whichever is greater) |
| Depth (Shallow) | 0–9 m (±0.018 m) |
| Depth (Medium) | 0–61 m (±0.12 m) |
| Barometric Pressure-Compensated Water Level | 0–9 m (±0.003 m) |
| Turbidity | 0–1000 NTU (±2% or 0.3 NTU, whichever is greater) |
| Chlorophyll-a | 0–400 µg/L (detection limit: 0.1 µg/L |
| Rhodamine WT | 0–200 µg/L (±5% or 1 µg/L, whichever is greater) |
| Ammonia/Nitrate (Freshwater only) | 0–200 mg N/L (±10% or 2 mg N/L, whichever is greater) |
| Chloride (Freshwater only) | 0–1000 mg/L (±15% or 5 mg/L, whichever is greater) |
| Brand | YSI |
|---|---|
| Origin | USA |
| Model | 6820/6920 V2-2 |
| Depth Rating | 15 m (ISE probes), 61 m (standard optical probes), 200 m (optional deep-water probes) |
| Data Storage Capacity | 150,000 readings |
| Sampling Interval | User-programmable |
| Battery Life | Up to 30 days at 15-min intervals |
| Power Supply | 12 V DC |
| Communication Interface | SDI-12, RS-232 |
| Compatible Display/Logger | YSI 650MDS |
| Software Platform | EcoWatch for Windows |
| Compliance | ASTM D1129, ASTM D3764, Standard Methods 2540–2550, US EPA Method 180.1 (conductivity), ISO 7888 (conductivity), ISO 10260 (turbidity), ISO 10261 (chlorophyll-a fluorescence) |