The connector of the probe is protected with a rubber sleeve. Auto Switch off - To save battery life, the application specific chip will turn the meter off after 5 minutes. Specifications HI 981409 and HI 981410 TDS and EC Gro'chek meters have been specifically designed to address the needs of operators in hydroponics, greenhouses and nurseries.
Calibration is easy and completely automatic.
Introduce the probe to the solution and wait until it is calibrated. This means that readings are quickly compensated for the temperature effect by the meters microprocessor so that you have accurate measurements, every time. HI 981409 and HI 981410 come in sturdy and waterproof casing. The specially designed stick meters actually float for quick retrieval if accidentally dropped in the fertilizer vat. Should the need arise to change the electrode, simply detach and replace it without having to take it to a specialist.