Measurement parameters: pH, ORP, DO, conductivity, TDS, salinity, resistivity, temperature
pH range: 0–14 pH, 0–80°C; 1–3 point automatic calibration (buffers included)
DO range: 0–20.00 mg/L, with rapid 5 min electrode polarization
Conductivity range: 0–200 mS/cm with platinum black sensor, auto temp. compensation
ORP range: -1999 to 1999 mV with platinum ring sensor
Data storage: 400 sets, IP57 water-resistant housing, rugged carrying case included
 

Measuring range: pH -2.000–20.000, ORP ±1999.9 mV, Temp. 0–105°C
Resolution: 0.001/0.01/0.1 pH; 0.1/1 mV; 0.1°C/°F (optional)
Accuracy: ±0.002 pH, ±0.2 mV, ±0.5°C
Calibration: 1–5 points for pH, 1 point for ORP, supports USA/NIST/DIN/custom buffers
Features: Auto temperature compensation, electrode diagnosis, calibration expiration reminder
Data storage: Up to 500 sets, USB data transfer, customizable settings menu
Dimensions: 210×188×60 mm, Weight: 1.5 kg, Power supply: DC 5V
 

Measuring range: pH -2.00–18.00, mV 0–±1999 mV
Resolution: 0.01 pH, 1 mV, 0.1°C
Accuracy: ±0.02 pH, ±0.1% FS (mV)
Temperature measurement & compensation: 0.0–100.0℃
Display: White backlight dual-row LCD, shows pH/mV and temperature simultaneously
Features: ORP measurement with electrode, slope & E0 display, multifunctional electrode holder
Dimensions: 240×180×70 mm, Weight: 1.0 kg, Power supply: DC9V
 

Measuring range: pH 0.00–14.00, mV 0–±1400 mV
Resolution: 0.01 pH, 1 mV, 0.1°C; Accuracy: ±0.1 pH, ±1% FS (mV)
Temperature compensation range: 0–60°C
Display: Blue backlight, dual-row LCD shows pH, mV, and temperature simultaneously
Features: ORP and ion-selective electrode measurement, high input impedance, stable readings
Dimensions: 220×160×65 mm, Weight: 0.3 kg
Power supply: DC 6V, suitable for laboratory and field use
 

Conductivity measurement range: 0.0 μS/cm to 20.00 mS/cm, resolution 0.1 μS/cm
Temperature range: 0.0℃ to 100.0℃, automatic/manual compensation with adjustable coefficient (0.00-10.00%)
TDS measurement range: 0.0 mg/L to 20.00 g/L with adjustable coefficient (0.40-1.00)
Salinity measurement range: 0.0 mg/L to 13.00 g/L
Auto range 1-point calibration, graphite electrode K=1.0 with anti-bubble design
IP65 waterproof rating with boat-shaped floating design and auto value lock
Dimensions: 180×40×45 mm; Weight: 95g; Power: 1×1.5V AAA battery
 

pH Measurement Range: 0.00–14.00 pH, Resolution: 0.01 pH, Accuracy: ±0.02 pH
Temperature Measurement Range: 0.0°C–100.0°C, Resolution: 0.1°C, Accuracy: ±0.5°C
Automatic 3-point standard buffer calibration with auto recognition
IP65 waterproof rating with boat-shaped float design, supports 1ml micro-sample measurement
Multi-line backlit LCD display with auto backlight and auto shut-off functions
Powered by 1 x 1.5V AAA battery, replaceable electrode
Dimensions: 180 × 40 × 45 mm; Weight: 95 g