Features 1、Sensitive and Accurate: This TDS water tester uses a titanium alloy probe for greater sensitivity and more accurate testing. 2、Portable and Convenient to Use: Compact in size and easy to carry around, so it can support to test the purity of water anywhere and anytime. 3、HD Backlit Display: Black frosted translucent shell with white backlit HD display, and the data is clearly visible wherever and whenever. 4、Easy To Operate: TDS test pen with simple button operation, just power on and use, quick test with high accuracy. 5、Wide Compatibility: The water quality test meter has a wide range of applications, such as drinking water, sewage treatment, water purification, aquaculture, hydroponics, etc Specification Item Type: TDS Test Pen Material: ABS Battery: 1.5V Button Battery 2 x CR2302 (Shipped Without Battery) Application: Domestic water, swimming pool, aquaculture, environmental water quality, agricultural water, fish tank water quality, greenhouse flowers, bottled water, community water station Basic Parameters: Test Range: 0 - 9990pm Package List 1 x Tester