Milwaukee pH51 Waterproof pH Tester with Replaceable Probe

SKU: 9139-PH51~ea

Milwaukee pH51 Waterproof pH Tester with Replaceable Probe

SKU: 9139-PH51~ea
Regular price $70.67 CAD
  • Secure payments
Shipping calculated at checkout.

Milwaukee pH51 Waterproof pH Tester with Replaceable Probe

The Milwaukee Waterproof pH51 Tester is a cost efficient, rugged and reliable pH tester.  It is ideal for use in aquariums, hydroponics, horticulture, pools and many other applications.

A large LCD screen makes reading results easy.  The probe is double junction allowing quick, accurate pH readings and response times. With easy 2-point manual calibration, this pH Tester is quickly calibrated to an accuracy of much more expensive meters.  It has an easily replaceable probe, offering years of carefree use.  The Tester is lightweight and waterproof to IP65.


  • Fast, easy to read results with a large digital LCD readout
  • Extreme pH accuracy to ±0.1 pH with a pH range (0.0 pH to 14.0 pH)
  • Lightweight and portable
  • Easy measurement: just place the probe in the sample, gently stir, wait for the stability indication to show a stable reading and then freeze the reading
  • Simple manual one or two-point calibration
  • Gel-filled, double junction pH electrode for low maintenance and high performance
  • Fully waterproof to IP65
  • Over 1500 hours of continuous battery life (batteries included)
  • Replaceable pH electrode


  • pH Range: 0.0 to 14.0 pH
  • pH Resolution: 0.1 pH
  • pH Accuracy: ±0.1 pH
  • Typical EMC Deviation: ±0.1
  • Calibration: Manual, 1 or 2 points
  • Probe: Replaceable double junction for extended life (MA73600)
  • Environment: 0 to 50°C / 32 to 122°F; max RH 100%
  • Battery Type: 3 x 1.5V; IEC LR44, A76 (included)
  • Battery Life: Approx. 1500 hours of continuous use
  • Dimensions: 7.9 inches × 1.5 inches (diameter)
  • Weight: 3.5 ounces (99.22 g)

Milwaukee pH51 Manual


All pH sensors have a limited life and response time gets longer with age. Properly maintaining your pH Tester will give you fast, accurate results for longer.

Here are four tips:
1. Always store with the cap full of buffer or storage solution MA9015, not water.
2. Clean your Tester regularly by soaking in cleaning solution MA9016.
3. Calibrate after cleaning and/or storage before testing to adjust for changes in the pH sensor.
4. Gently stir the Tester in the sample for a faster result.

Recently viewed