Everything you need to measure pH, conductivity and temperature

Handheld design is compact and convenient

The backlit display is bright and easy to read

Designed for nutrient reservoirs, the Bluelab pens are waterproof and float in any solution

Bluelab pH Pen
Measure pH and temperature
Double-junction probe and simple, 2-point pH calibration with 30-day reminder
Bluelab Conductivity Pen
Measure conductivity in EC, ppm 500 (TDS) and ppm 700 scales
Read temperature in C or °F
Factory calibrated and ready to use out of the box