Replaceable combo probe with double junction pH sensor and titanium EC sensor
Electrode condition indicator and calibration reminder function help you perform proper maintenance in a breeze
Apera Instruments GroStar GS4 pH/EC/ppm Combo Pen Tester (Gen II) is a lab-grade multiparameter meter designed specifically for growers to easily manage crop success, featuring a replaceable pH/conductivity combo sensor and a grower-friendly workflow along with other ligent functions and features that help reduce the guesswork and give you the confidence in every measurement.