Features1[Four In One] Digital water tester designed for PH, TDS, EC conductivity, temperature 4 functions, one key switch, easy to operate and use. 2[Multi Application] Water quality test pen is suitable for home drinking water, aquaculture, swimming pools, aquariums, greenhouse flowers and plants, laboratories, etc. 3[Backlight Display] This digital water tester pen automatically starts the backlight display, to ensure that the dim environment can also see the value. 4[Sensitive And Accurate] Alloy probe and high sensitivity glass electrode, high testing accuracy, can automatically make up the temp difference to reduce the measurement error. 5[Compact And Portable] Digital water quality meter has a simple and fashionable design, lightweight, easy to carry, convenient to use at any time and anywhere.SpecificationItem Type: Digital Water Tester PenMaterial: ABSSize: Length: Approx. 150mm / 5.9in, Width: Approx. 29.5mm / 1.2inGross Weight: Approx. 123g/4.3ozBattery Type: Built in Button Battery (Shipped with Built in Button Battery)Battery Model: LR44Battery Capacity: 150mAh x 2Package List1 xDigital Water Tester Pen 3 x Test Strips 1 x English Manual 1 x Storage Box