Hanna GroChek pH/EC/TDS/Temp ComboThis indicator continuously monitors the three most crucial nutrient parameters in hydroponic, greenhouse, and horticultural applications. At startup, the GroChek performs a self check to assure proper working condition. The stability indicator and HOLD function lets the user know when to take readings and freezes the reading on display for easy and accurate recording. This instrument is supplied with a non clogging double junction pH electrode as
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