Portable Multi-parameter Water Quality Meter PH-900P (CAT#: STEM-OEM-0257-ZJF)

The Portable Multi-Parameter Water Quality Meter is a versatile and high-precision instrument designed for field analysis of various water parameters. Suitable for laboratories, wastewater treatment, environmental monitoring, and industrial use, it supports the measurement of pH, conductivity, and dissolved oxygen with rapid response.
Accessories include: pH/conductivity/dissolved oxygen electrodes, temperature probe, pH buffer solution, conductivity standards, dissolved oxygen electrolyte, membrane cap, and a carrying case.

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 (Optional)
- Range: 0.001~19999 (depends on ISE range)
- 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: 3×1.5V AA batteries or DC 5V adapter
- Dimensions: 170×85×30 mm
- Net Weight: 300 g
- Packing Size: 450×320×100 mm
- Gross Weight: 2 kg

Equipped with 3.5" backlit LCD screen.
pH: 1-5 point calibration, compatible with USA, NIST, DIN buffers; slope/offset diagnostics.
ORP: 1-point offset calibration, supports relative/absolute millivolt readings.
Ion concentration: 2-5 point calibration, direct reading with unit selection (ppm, mg/L, mol/L, mmol/L).
Conductivity/TDS/Salinity/Resistivity: 1-5 point calibration, supports seawater and pure water modes.
Dissolved oxygen: 1 or 2-point calibration with salinity/barometric compensation.
Includes Auto-Read, calibration due alarm, auto-power off, and full setting menu.
Stores up to 500 data sets, USB data transfer, multi-mode power supply.

STEM-OEM-0255-ZJF
STEM-OEM-0256-ZJF
STEM-OEM-0258-ZJF
STEM-OEM-0259-ZJF