HANNA Instruments GroChek Combo Meter continuously monitors the three most crucial nutrient parameters in hydroponic, greenhouse and horticultural applications. Includes a large, dual level, back-lit LCD to give instantaneous readings of pH, EC or TDS and temperature, even from a distance.
The HI 991404 ships complete with a non-clog double junction pH electrode and a rugged conductivity/ TDS sensor, 12 volt power transformer and buffer solutions 4 and 7 together with conductivity calibration solution. Warranty: 2-years (six months on electrode).
Instruction Manual – PDF format
To prolong the life of the pH electrode, we recommend cleaning it monthly by immersing it in HANNA’s cleaning solution (HI 7061) for half an hour. After-wards, rinse it thoroughly with tap water and recalibrate the meter.