[Design] Equipped with rust resistant probe and clear LCD display with backlight, easy to read and record. Small size and light weight, easy to carry and [Function] Digital water tester for measuring PH, TDS, SALT, SG, ORP, , Hydrogen, Resistivity, Temperature and Nutrient, widely used in drinking water, swimming pool, fish tank, aquarium. The sensitive probe enables the Ph meter to measure values in seconds [Parameter] The PH tester can set the max or mini limit of PH//ORP. If the test is out of range, the value of The PH tester will be displayed in red Colour:Photo Color Material:ABS Package Contents: 1 x PH meter(3X LR44 Battery Not Included) 1 x English manual Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.