Hanna HI98121 digital meter


TFP Expert
Platinum Supporter
LifeTime Supporter
May 7, 2007
Silver Spring, MD
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Hanna is a reasonably good brand, but few of the multi-function $100 meters last more than a season, if that. If you keep it calibrated the PH and temperature measurements should be fairly good. ORP readings are essentially worthless except in special circumstance.