35 mg/L (ppm)

Ensure the filter is held straight

Store it wet

Regular calibration with pH buffer solutions (4

Salmonella

Bluelab pH Pen – Waterproof Handheld pH & Temperature Meter | Double-Junction Probe | Made in NZ shower filter replacement cartridge 35 mg/L (ppm)Bluelab pH Pen Waterproof Handheld pH & Temperature Meter The go to pH pen for growers worldwide. The Bluelab pH Pen (SKU: PENPH) is a compact, hardy, and easy to use handheld meter that delivers accurate pH and temperature readings in any nutrient solution. With a double junction pH probe, 0. 1 pH resolution, simple 2 point calibration, and a fully waterproof design that floats its the essential measurement tool for every growing setup, from home