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PH-200 Waterproof pH Meter - HM Digital


Item #: HB00002

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The PH-200 is a professional grade pH/Temp meter ideal for all pH testing water. With its advanced microprocessor it provides highly accurate dependable readings in such applications as hydroponics, purification applications, wastewater regulation, aquaculture, colloidal silver, labs & scientific testing, pools & spas, ecology testing, boilers & cooling towers, water treatment, wine, coffee, and agriculture.


  • Waterproof housing (IP-67 rating)
  • Digital automatic calibration (one point), with digital fine tuning
  • Automatic Temperature Compensation (ATC)
  • Auto-off function, data-hold function and low-battery indicator
  • Easy-to-read LCD screen with simultaneous temperature display
  • Replaceable Sensor (model SP-P2)
  • Factory Calibrated: The PH-200 meter is three-point checked and factory calibrated to pH 7.0.
  • UPGRADED: Includes a translucent cap, 2 Triple A (AAA) batteries, lanyard, and pH 7.0 buffer (sachet)


  • pH Range: 0 – 14
  • Temperature Range: 0-55 °C; 32-130 °F
  • Resolution: 0.01 pH; Temperature resolution is 0.1 °C/F
  • Accuracy: +/- 0.1 pH; Temperature accuracy is +/-1%
  • Minimum EC/TDS: 5 uS/10 ppm
  • Electrode: Replaceable glass sensor and reference tube electrodes
  • Housing: IP-67 Waterproof (submersible; floats)
  • UPGRADED: Power source: 2 x Triple A (AAA) included
  • Dimensions: 18.5 x 3.4 x 3.4 cm (7.3 x 1.3 x 1.3 inches)
  • Weight: 96.4 g (3.4 oz)

Manufacturer information

HM Digital, Inc.
Established in 1987, HM Digital, Inc. (formerly known as Heemang Electronics) is an original equipment manufacturer (OEM) that has been recognized worldwide for providing the best values in water testing instrumentation, especially the increasingly popular TDS meter.

4 Stars


Reviewed on
August 11, 2020

Yes, I would recommend this.

Simple and reliable

This meter is easy to calibrate, and tends to hold calibration longer than others I've used. Good value for the price!

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Reviewed on
May 29, 2014

Yes, I would recommend this.

Very Good for the Beginner Aqu

This meter is a very good buy for those just starting out as an aquarist. The meter really needs to be submerged well into the water, to the gasket line, and in the mid third of the tank for the most accurate reading. I have also found that I need to submerge two times in two different locations of the tank (I have a 65 gallon reef tank) for absolute assurance of consistency in the readings. Overall, I think this is a great teaching tool as one begins to learn the science and execution of monitoring devices, their purpose, and ease of use. While other meters are less expensive, I have found this device (the third one I have tried) to be the easiest to use and provides the exact data I need. If I were to criticize anything it would be the instructions. I don't believe that is necessarily attributed to just this meter, however, as I have seen poorly written instructions accompany many aquarium devices.

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william anast

Reviewed on
June 27, 2011

No, I would not recommend this.

what to watch for

Make sure the probe has liquid in cap when you open it. Also make sure the extra vial has fluid in it. Mind came dry.

Was this review helpful? 7 0


Reviewed on
July 26, 2010

Yes, I would recommend this.


Works like a charm. Easy to understand and use. Very convenient way to spot check parameters without having to carry around a probe and box like other monitors. Price was right!

Was this review helpful? 4 0


Reviewed on
July 23, 2010

Yes, I would recommend this.

HM PH Meter

I knew very little about PH Meters and thought this was going to be an easier way to check the PH in my display tank. It is not easier, but it is more accurate. It will need to be calibrated with both a 7.01 and 10.01 PH solution (at least twice a month). I recommend buying PH probe storage solution, and extra 7.01 and 10.01 calibration fluid. The temperature gauge on this unit is not accurate and you will get fluctuations of 3-5 degrees. If you are using it solely as a PH probe (not temp) and don't mind calibrating the unit often, then it is a good economical unit.

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