Apera Instruments GS4-P 6-in-1 pH/EC/ORP Combo Pen Tester Kit with Replaceable Probes for Hydroponics, Aquariums, Pools & Drinking Water - Accurate Water Quality Testing for Home & Lab Use

Apera Instruments GroStar GS4-P pH/EC/ppm/ORP Combo Pen Tester (Gen II) is a lab-grade multiparameter meter kit designed specifically for growers to easily manage crop success, featuring a replaceable pH/conductivity combo sensor and a grower-friendly workflow along with other intelligent functions and features that help reduce the guesswork and give you the confidence in every measurement.

Lab-grade instrument designed specifically to meet growers' needs and habits

Measures pH, EC, 700ppm, 500ppm, ORP, and temperature with premium probe technologies, ensuring high accuracy and durability with minimal maintenance

Grower-friendly calibration workflow on an HD backlit screen allows you to finish 2-point calibration within a minute

Replaceable combo probe with double junction pH sensor and titanium EC sensor, ORP probe included for ORP (redox) test

Electrode condition indicator and calibration reminder function help you perform proper maintenance in a breeze