Lock function easy to read and record press HOLD button then remove from test solution. The instrument will automatically shut down after 5 min of inactivity. Conductivity: 0 - 9999µs/cm TDS: 0 - 9999ppm Degrees Celsius: 0.1 - 80.0 Celsius Fahrenheit: 32.0 - 176.0 Fahrenheit Resolution: TDS: 1ppm; EC: 1µs/cm Battery: 1x3.0V (CR2032) Accuracy: ± 2% Colour:White Material:plastic Size:152 x 30 x 14mm Package Contents: 1 x TDS & EC Meter Only the above package content other products are not included. Note: Light 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.