Measurement ranges: -2.0 to 16.0 pH; -5 to 60 °C (23–140 °F) Accuracy: ±0.1 pH; ±0.5 °C (@ 25 °C) Resolution: 0.1 pH; 0.1 °C/°F Calibration: Automatic 1- or 2-point with dual buffer sets (pH 4.01, 7.01, 10.01 or 4.01, 6.86, 9.18) Probe: Replaceable Mi56P double-junction, gel-filled probe for extended lifespan Waterproof: IP65-rated housing protects against dust and moisture Display: Dual-level LCD with stability indicator and HOLD function for easy operatio Battery life: Approximately 300 hours; auto-off after 8 minutes of non-use Weight: ~100 g (3.5 oz) — highly portable for fieldwork Use cases: Perfect for aquaculture, hydroponics, pools, food & beverage, water treatment, labs, and environmental testing

MI56P
M10004
M10007
M10016
MA9015

PH55 User Manual.pdf

CARE AND USE

All pH sensors have a limited life and response time gets longer with age. Properly maintaining your pH pen tester will give you fast, accurate results for longer. So, be sure to order the Milwaukee pH Maintenance Kit code PH-Main at checkout time! This will be needed to help clean and condition the pH electrode before use!

Here are our top four tips.

Always store upright with the cap full of MA9015 Storage solution for BEST RESULTS.
Clean your Tester regularly by soaking in M10016 Cleaning Solution for about 20 minutes.
Calibrate after cleaning and/or storage before testing to adjust for changes in the pH sensor.
Gently stir the Tester in the sample for a faster result.