Item Type: TDS Meter_x000D_ Material: Plastic, Alloy_x000D_ Battery Type: 1 x 220mAh CR2032 Button Cell (Shipped with Built in Battery) 1Highly Accurate Measurement: Measures the total dissolved solids (TDS) content of water using a precise sensor to provide accurate results. 2Home Water Purifier: Helps you understand the quality of tap water in your home and determine if additional water purification measures are needed. 3Multifunctional test: In addition to the TDS water quality test, it can also measure water temperature, providing you with comprehensive water quality information. 4Simple and easy to use: Simply dip the tip of the pen into the water to quickly measure water quality and display the results on the large screen. 5PORTABLE DESIGN: Compact and lightweight, easy to carry, you can test the water quality anytime and anywhere to ensure the safety of your drinking water.1 x TDS Meter