Apera AI104G GroStar GS4 5-in-1 pH/EC/TDS/500ppm/700ppm Water Quality Tester Pen Kit with Replaceable Double-Junction Probe - Perfect for Hydroponics, Aquariums, Pools & Home Water Testing

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 intelligent functions and features that help reduce the guesswork and give you the confidence in every measurement.

Lab-grade pH/EC/TDS meter designed specifically to meet growers' needs and habits

Measures pH, EC, 700ppm, 500ppm, 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

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