Model Number: ez-9909 Display Type: Digital With Backlight Or Not: YES Multi-functional water quality tester Conductivity measurement range: 0 to10000uS/cm 10.01-19.99ms 20.1-400ms/cm. accuracy: ±2% of the reading TDS measurement range: 0 to 1000ppm 1000ppm to 10000ppm 10.1 to 200.0 PPT Salinity measurement range: 0.00 to 25.00% resolution: 0.01% PH measurement range: 0.01-14.00pH, resolution: 0.01pH, accuracy: ±0.05pH Colour:As shown Material:plastic Package Contents: 1 x 5 in 1 Water quality tester(with backlight) 1 x English manual 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.