Eco-Friendly - Sustainable citrus-based formula

Stage 4 — Additional Carbon Filtration

Sealed Against Light & Air — Maintains solution integrity from production to point of calibration

Heavy Metals — Including lead

The HI98118 GroLine pocket pH Tester is an affordable way to measure the pH of hydroponic nutrient solutions

Hanna HI98131 GroLine pH EC TDS Temperature Tester - Waterproof Pocket Meter alexapure filter 4-pack Eco-Friendly - Sustainable citrus-based formulaThe HI98131 is a slim, lightweight, and waterproof pocket tester that measures pH, conductivity (EC), TDS (ppm), and temperature. Simple, two button meter operation and advanced features, including a selectable EC to TDS conversion factor (0. 5 500 ppm and 0. 7 700 ppm). for your essential testing. All measurements in a single, hassle free tester. Quick Cal solutions to calibrate pH and conductivity all at once with a single solution. Perfect for