Bluelab EC pens will give you accurate EC and temperature readings each time. The Bluelab EC pen features a low battery warning, successful calibration button plus is totally waterproof.
Ensuring that your nutrient is at the correct EC level ensures you are not overfeeding or underfeeding your plants. Checking the temperature of your nutrient solution is important especially when growing in hydroponic systems such as Deep Water Culture, RDWC and other soilless systems.