Hanna Phep 5 pH meter, model HI98128
Proper mash and water pH adjustment requires us to measure pH.
We use a Hanna Phep 5 pH meter, model HI98128 (shown in picture). It is completely waterproof and even floats. (Yes, we have dropped ours at least once in our boil kettle!).
Just like the digital probe thermometer, having a waterproof pH meter is (in our opinion) an absolute must. We don't have to worry about humidity getting into the unit and cleaning it under the faucet is dead simple and worry-free as there is no chance of getting the wrong parts wet.
This unit reads to 0.01 pH resolution and includes 2-point calibration for greater accuracy, a built in thermometer (very handy), and automatic temperature compensation up to 140F. The electrode (tip) is replaceable too. We brew approximately once or twice a month and are only on our second electrode after 10 years of use. Our first electrode read reliably for approximately 8 - 9 years and then the readings started to jump around and not stabilize. Once the readings start to jump around, it's time to replace the electrode.
You can purchase cheaper pH meters but they're not waterproof, do not float, only include 1-point calibration (not as accurate), are not temperature compensated, and do not have replaceable electrodes. Once again, you get what you pay for.
Be careful when purchasing as there is a very similar looking Hanna Phep 4 pH meter (model HI 98127) that only reads to 0.1 pH resolution. Make sure to check the model number.
Don't need something quite as portable or want to be able to take temperature measurements separately? Consider the Milwaukee MW102. It's been receiving rave reviews from brewers.
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