This is a digital TDS meter tester to test the filter water quality purity, to check the performance of your water filter, to check for hardness (1grain=17ppm), to make sure you always drink pure water. 
Features:
* Auto-off function: turns off meter after 5 minutes of non-use to conserve batteries 
* Automatic temperature compensation and Shift between TDS and Conductivity 

Specifications: 
Measurement range: 
EC: 0-9990 micro-Siemens/cm (us/cm); TDS:0-9990ppm; Degrees Celsius: 0.1-80.0 Celsius; 
Fahrenheit: 32.0-176.0, Accuracy: ±2% , Size: 154mm * 30mm * 14mm, Color: White

For more inquiries look for Ms. Ann