Tester with 4 Display Modes This advanced water hardness test combines TDS (Total Dissolved Solids), CE (Electrical Conductivity) and a 3 in 1 digital temperature measuring test pen. This pH meter has 4 display modes to choose from, TDS - ppm and C, CE - s / cm and C, TDS - ppm and F, CE - s / cm and F (press the button MODE to convert). Bright alarm function Lock function makes it easy to read and record, press the HOLD button, then remove it from the test solution . The pH tester has light alarm function, green backlight with TDS value less than 40; red backlight when the TDS value is over 40. Auto Power Off The non-working pH tester 2 minutes automatic shutdown, so that the battery does not discharge, a function Convenient automatic power-off ensures long battery life. Wide Application This digital TDS tester provides a detailed and accurate report on the quality of drinking or used water for your animals pets, your fish and your gardening. Automatic temperature compensation ensures accurate readings in cold and hot water. Several Accessories 1 * PH meter, 1 * protective case, 1 * PH test strip, 1 * user manual. CE: 0 to 9990 s / cm TDS: 0 to 9990 ppm (parts per million) Temperature range: 1-80 C; 33 to 176 F Accuracy: +/- 2% Package contents: 1 x water test meter 1 x protective leather case Note: It does not include other things, the color is based on the first picture, and other pictures only show the effect Due to the differences between different monitors, the picture may not reflect the actual color of the item. Due to manual measurement. Please allow deviation. Thank you!