Hanna Instruments Combo pH, EC/TDC/Temperature monitor
Model HI 991404: A large backlit LCD continuously monitors the three most important nutrient parameters in greenhouse, hydroponics and horticultural applications.
This Hanna Instruments Combo GroChek is waterproof, has adjustable TDS ratio and ß and an external 12 VDC power supply.
It has an advanced, non-cloggin, double-junction pH electrode and a rugged conductivity probe that will stand up to the most aggressive environments.
The Combo GroChek also provides a stability indicator for peace of mind.
