Apera Instruments GroStar Series GS1-P pH/ORP Pen Tester Kit with Replaceable Double-Junction pH Probe and ORP Probe for Hydroponics Water Quality Testing, Gen II

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About This Lab-grade instrument designed specifically to meet growers' needs and habits Measures pH, ORP (redox), and temperature with premium probe technologies, ensuring high acc uracy 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 double-junction pH and ORP probe Electrode condition indicator and calibration reminder function help you perform proper maintenance in a breeze Show more