Basic TDS/PPM/EC Digital Water Meter enables you to test the quality of various sources of water. TDS/PPM/EC Meters are essential to a hydroponic grower to ensure your nutrients are the correct strength for each stage of your plant's development. It provides 1,000 hours of continuous usage which ensures you the best quality water. Suitable for drinking water, water filters, hydroponics, aquariums, food, coffee, pools, spa etc.
The hold button is aimed at saving measurments for convenient reading and recording. It also has aut-off function, which can turn off after 5 minutes of non-use to conserve batteries.