Features: There are 2 types, with backlight/non, choose your own. The pH meter is designed specifically for quickly and accurately. Newly developed high-precision multifunctional water quality tester, which measures H2 & temp. It is very convenient to use, just need to insert meter into the liquid to display the reading. Widely used in water quality testing, household drinking water testing, etc. Package Includes: 1x Water Quality Tester Specifications: Material: Plastic Housing Size: approx 232(length) X 80(width) X 47(height)mm/9.1x3.1x2in Type: with backlight/non Power supply: 3x built-in button cell /F switchable note: Please allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item.