Benchtop Multiparameter Water Quality Meter PH-900 (CAT#: STEM-OEM-0258-ZJF)

The Benchtop Multiparameter Water Quality Meter is a comprehensive analytical solution for laboratory and industrial water quality testing. It supports simultaneous measurement of pH, conductivity, and dissolved oxygen with high accuracy, making it ideal for research, quality control, and environmental analysis.
Accessories include: pH/conductivity/dissolved oxygen electrodes, temperature probe, pH buffer sachets, conductivity standard solutions, DO electrolyte, membrane cap, electrode holder, USB cable, and power adapter.

pH
- Range: -2.000~20.000 pH
- Resolution: 0.001, 0.01, 0.1 pH (selectable)
- Accuracy: ±0.002 pH
- Calibration Points: 1 to 5 points
- Buffer Options: USA, NIST, DIN, 2 custom buffers
ORP (Optional)
- Range: ±1999.9 mV
- Resolution: 0.1, 1 mV (selectable)
- Accuracy: ±0.2 mV
- Calibration Points: 1 point
Ion Measurement (Optional)
- Range: 0.001~19999 (depending on ISE)
- Resolution: 0.001, 0.01, 0.1, 1
- Accuracy: ±0.5% F.S. (monovalent), ±1% F.S. (divalent)
- Units: ppm, mg/L, mol/L, mmol/L
- Calibration Points: 2 to 5 points (0.001, 0.01, 0.1, 1, 10, 100, 1000, 10000)
Conductivity
- Range: 0.1~2 μS/cm (CON-0.1, optional); 2~20 mS/cm (CON-1, standard); 20~200 mS/cm (CON-10, optional)
- Resolution: 0.001, 0.01, 0.1, 1
- Accuracy: ±0.5% F.S.
- Calibration Points: 1 to 5 points
- Calibration Solutions: 10 μS/cm, 84 μS/cm, 1413 μS/cm, 12.88 mS/cm, 111.8 mS/cm
- Temperature Coefficient: Linear (0.0~10.0%/°C), pure water
- Reference Temperature: 20/25°C
- Cell Constant: K=0.1, 1, 10 or custom
TDS
- Range: 0~10.00, 100.0, 1000 ppm; 10.00, 200.0 ppt
- Resolution: 0.01, 0.1, 1
- Accuracy: ±1% F.S.
- TDS Factor: 0.1~1.0 (default 0.5)
Salinity
- Range: 0.00~42.00 psu, 0.00~80.00 ppt
- Resolution: 0.01
- Accuracy: ±1% F.S.
Resistivity
- Range: 0.00~20.00 MΩ
- Resolution: 0.01
- Accuracy: ±1% F.S.
Dissolved Oxygen (DO)
- Range: 0.00~20.00 mg/L; 0.0~200.0% saturation
- Resolution: 0.01 mg/L, 0.1%
- Accuracy: ±0.2 mg/L, ±2.0%
- Calibration Points: 1 or 2 points
- Barometric Pressure Correction: 60.0~112.5 kPa / 450~850 mmHg (manual)
- Salinity Correction: 0.0~50.0 g/L (manual)
Other Specifications
- Temperature Compensation: 0~100°C / 32~212°F, manual or automatic
- Memory: 500 data sets
- Interface: USB communication interface
- Power Supply: DC5V power adapter
- Dimensions: 210×188×60 mm
- Net Weight: 1.5 kg
- Packing Size: 300×250×200 mm
- Gross Weight: 1.7 kg

6.5-inch backlit LCD display with intuitive interface.
pH: 1-5 point calibration, buffer recognition, slope/offset diagnostics.
ORP: 1-point offset calibration with reliable millivolt modes.
Ion concentration: 2-5 point calibration, supports direct reading and unit conversion.
Conductivity/TDS/Salinity/Resistivity: 1-5 point calibration, seawater/pure water modes supported.
Dissolved oxygen: 1 or 2-point calibration with environmental compensation.
Other functions: Auto-Read, calibration reminders, setup menu, USB interface, 500 data memory, reset function.

STEM-OEM-0256-ZJF
STEM-OEM-0257-ZJF
STEM-OEM-0259-ZJF
STEM-OEM-0260-ZJF