This product contains one pH meter, one TDS/EC/Temperature meter, an instruction manual, pack each of pH calibration buffers 4.00, 6.86, and 9.18, PH and TDS each have 2 x 1.5V LR44 battery (built-in). PH Meter: Full measurement range of pH 0-14; High accuracy of 0.01 pH, reliable and quick readings. 3 in 1 TDS Meter: Measurement range of 0-9990ppm, 0-9990s/cm, 0-80.0 (32.0-176.0); High accuracy of 2% F.S. We kindly remind you not to use it to test sea water. Reliable Automatic Temperature Compensation (ATC) ensures testing results be accurate under different temperature conditions. PH Meter and TDS Meter, respectively adopt low impedance sensitive bulb and agile titanium alloy electrode respectively. Remove the protective cover, Press the switch button, Immerse the probe of the pH Meter/TDS Meter in the solution, and you can get the reading immediately. Comes with protective case; , Handheld design for portability and convenience. PH meter and TDS& EC meter can test pH balance, Suitable for testing drinking water, swimming pools, hydroponics, aquarium, spas, food , etc(Note: TDS meter can't test seawater). The and portable size of the water meter allows you to easily carry it with you, and measure it anytime, anywhere. Test the purity of drinking water to it's healthy, Monitor if Reverse Osmosis ()/DI System works properly, whether filter need replaced, Maintenance aquarium, Hydroponics(test nutrients) and pool etc. It is very suitable for scientific experiments in children's schools, Testing different bottled water. Color: As Shown Material: plastic Package Contents: 1 set x tds meter Only the above package content, other products are not included. Note: Light reflection 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.