The Hanna Dual GroChek HI 991404 continuously monitors pH/EC/TDS/Temp. in your nutrients. Comes with a rugged, non-clogging pH electrode and conductivity probe that will stand up to the most agressive environments.

Calibration and temperature compensation is automatic, while the EC/TDS conversion factor and temperature coefficient are user adjustable for application specific measurements.

Dual-level backlit LCD.

The Hanna GroChek Combo HI 981404N is ideal for hydroponic applications where pH and TDS levels need to be continuously monitored. These wall mount monitors feature a large, easy-to-read LCD that displays pH and TDS readings simultaneously.

Can be calibrated at one or two points in the pH range (pH 4 and 7) and at one point in the TDS range.

The instrument is powered by a 12VDC transformer.