[Water quality detector set]It includes 1 piece of PH tester \u0026 1 piece of 3 in 1 TDS Teser(It can measure TDS,EC,Temperature) [Measure Range]TDS:0-9999ppm;EC:0-9999us\/cm;PH:0.00-14.00PH;:0.1-80.0;:32.0-176.0 [Backlight]Both PH Meter TDS\u0026EC Meter have backlight function. [PH calibration powder]The PH meter is equipped with 2 sets of PH calibration powder.Each package of calibration powder needs to be mixed with 250ml of purified water or distilled water. [Power supply]TDS\u0026EC pen powered by 1 CR2032 battery.The pH meter is powered by 2 LR44 batteries. Color: Yellow \u0026 White Material: ABS Package Contents: 1x PH Teser 1x TDS Teser 6x PH calibration powder Only the above package content, other products are not included. Note: Light reflection different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is and\/- 1-3cm.