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![]() I like my Hanna waterproof pH meter. The probe is 4 years old or so, and I haven't had to replace it yet. Cheap ones you will replace the probe every 2 years or more even. Accuracy is +/- 0.05 and is temperature compensated.
http://www.aquariumtanksupply.com/ha...a_11414266.php ![]() |