4 in 1 Digital Water Quality Tester TDS Meter EC Meter and Temperature Meter for Drinking Water Hydroponics Aquariums Pools. Features accurate and reliable results with a high-precision chip and premium titanium alloy probe. Multifunctional with 5-Level Upgrade including TDS EC Celsius and Fahrenheit measurements. Large backlit LCD auto-lock factory calibration hold feature and auto-off after 2 minutes to save battery life. Versatile TDS tester for drinking water purity safety and health. Monitor RO/DI systems aquarium maintenance hydroponics well water pools hot tubs spas tap bottled water and more.