Pen-type pH meter suitable for hydroponics, aquaponics / aquaculture, swimming pools and spas, food production andchemical industry, fast response, reliable and accurate measurement, large LCD display 21 x 18 mm for reading convenient, automatic temperature compensation, 0-14pH range, +/- 0.1 accuracy, 0.1pH resolution, screw-on storage solution bottle and made from impact-resistant ABS, 33.5 x 179mm dimension, 90 g weight.