Is Your Water Really Safe: We cannot visually determine the purity of drinking water. Even seemingly clear and transparent water may contain a lot of impurities. That's why it's essential to test your water before drinking it. Multifunctional (4 in 1) and Upgraded: Professional TDS (Total Dissolved Solids), EC (Electrical Conductivity) and Temperature (Fahrenheit temperature & Celsius temperature) Meter 4 in 1. Upgraded with big backlit LCD for easier reading, and auto-lock function for easier use. These enhancements a user-friendly tds meter digital water tester for a variety of applications. Please note: the physical slightly color difference or difference, does not affect the use, please do not mind, thank you! Colour:white+black Material:ABS Package Contents: 1 x Water Test Pen 1 x English instruction 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 picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.