Milwaukee ORP57 Waterproof Dual Level ORP Tester

ORP57 Pocket-size ORP / Temperature Meter with replaceable electrode

IP65 Waterproof pH tester with Large dual-level LCD that displays ORP and temperature (°C or °F). The large display shows readings from -1000 to +1000 (with a resolution of 1 mV) and simultaneously shows temperature from -5.0 to 105.0°C or 23.0 to 221.0°F. ORP57 has a stability indicator and hold function that freezes the display for easy and accurate recording.

The large display also has graphic symbols to guide you through all operations. Complete with a temperature probe for faster and more precise temperature measurement it compensates automatically for temperature. Auto power OFF saves battery power after non-use. The double-junction electrode can be replaced in a very fast and simple way! The modular design allows easy electrode and battery replacement.

mV Range ±1000 mV
Temp Range -5.0 to 60.0°C / 23.0 to 140.0°F
mV Resolution 1 mV
Temp Resolution 0.1°C / 0.1°F
mV Accuracy ±2 mV
Temp Accuracy ±0.5°C / ±1°F
pH Typical EMC Deviation ±2 mV
mV Typical EMC Deviation ±0.3°C / ±0.6°F
Redox calibration factory calibrated
Probe Mi57P (replaceable)
Environment 0 to 50°C / 32 to 122°F; max RH 100%
Battery Type 4 x 1.5V; IEC LR44, A76 (included)
Battery Life approx. 300 hours of use
Auto-off after 8 minutes of non-use
Dimensions 200 × dia 38 mm
Weight 100 g


Mi57P Replaceable electrode for ORP57
MA9015 Electrode storage solution, 230 mL
MA9016 Electrode cleaning solution, 230 mL
MA9020 ORP test solution (200/275 mV), 230 mL bottle
M10000B Electrode rinse solution, 20 mL (25 pcs)
ORP57 is supplied complete with protective cap, carton box, batteries and instructions.