Dear，Pls leave a massage to tell us what design (Color) do you want.thank you.

Features：Saves measurements for convenient reading and recordingAuto-off function: turns off meter after 5 minutes of non-use to conserve batteriesAutomatic temperature compensationShift between TDS and ConductivityCan be used in : Water purifiers and filters， food(vegetable ， fruit)&drink quality monitoring， pools and spas， aquarium， hydroponics.Conductivity: 0 -- 9990 us/cmTDS: 0-5000ppmDegrees Celsius: 0.1—80.0a??- Fahrenheit : 32.0—176.0a?‰Accuracy: 2%Size: Approx 154 x 30 x 14mmIncluded：1 x TDS Tester1 x User Manual