| Management number | 232334100 | Release Date | 2026/06/21 | List Price | $15.94 | Model Number | 232334100 | ||
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The Milwaukee Waterproof pH55 PRO pH/Temp. Tester is one of our most accurate cost effective, well rounded, rugged and reliable testers in the market featuring dual level LCD readouts, easily replaceable probe and extended pH ranges to meet almost any application. It's simple 1 or 2 point automatic calibration is simple-to-use and offers TWO sets of memorized buffers to select. Ideal for use in aquariums, hydroponics, horticulture, education, pools, beer and many other applications.
The Milwaukee Waterproof pH55 pH/temp. tester offers:
Accuracy
The Waterproof pH55 PRO tester is accurate to ±0.1 pH & ±0.5°C (+/-1°F) and is easy to read.
With easy 2 point automatic calibration, this pH tester is quickly calibrated to an accuracy of much more expensive meters. Simple design and rugged, it brings great value for any application. Why guess at your readings using litmus paper when you can have guaranteed accurate, digital LCD results.
Long life
The tester comes with a replaceable pH probe with a double junction probe designed for longer life.
Fast response
The probe is double junction allowing quick, accurate pH readings and respose times.
Waterproof construction
No more worries about dropping your tester while measuring. The pH55 PRO is waterproof to IP65.
Light weight
At just 3.5 ounces, the pH55 PRO is easy to handle at up to half the weight of other testers.
Ease-of-use
A large Dual Level LCD screen with easy-to-read graphic symbols, makes it easy while calibrating or reading your measurement. This takes the takes the guess work out of litmus paper.
Design Features
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!
Store the pH probe in storage solution MA9015. Only use tap water short-term if MA9015 is not immediately available and NEVER store in distilled Water (DI) or Reverse Osmosis (RO) water. This will damage the sensitivity of the probe.
Here are top four tips.
Specifications for Milwaukee PH55 PRO
| pH Range: | -2.0 to 16.0 pH |
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| Temperature Range: | -5.0 to 60.0 °C (23 to 140 °F) |
| pH Resolution: | 0.1 pH |
| pH Accuracy: | ±0.1 pH |
| Temperature Accuracy: | ±0.5 °C (±1 °F) |
| Typical EMC Deviation: | ±0.1 |
| Typical EMC Temperature Deviation: | ±0.3 °C (±0.6 °F) |
| Temperature Compensation: | Automatic from -5 to 60 °C (23 to 140 °F) |
| Calibration Automatic: | 1 or 2 points with 2 sets of pre-memorized buffers (pH 4.01, 7.01, 10.01) or (pH 4.01, 6.86, 9.18) |
| Probe: | Replaceable double junction for extended life (Mi56P) |
| 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 continuous use |
| Auto-off: | After 8 minutes on non-use |
| Dimensions: | 7.9 inches - 1.5 inches (diameter) |
| Weight: | 3.5 ounces (99.22 g) |
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