Features 1、Application scope: pure water production and drinking, electro‑fluid, boiler water, fish tank water, swimming pool water, photographic washing fluid, well water, deep well water, laboratory, aquaculture, food processing, home, office, physical and chemical teaching, ionized water, cosmetics, municipal water supply, travel health care. 2、The test is accurate and reliable, the test is accurate and the test range is 0‑9990ppm. 3、This type of TDS detection pen can detect heavy metals and turbidity in water. 4、The product is small and portable and can be placed in a bag without taking up space. 5、This product has excellent workmanship and very precise measurement. Specification Condition:100% Brand New Item Type: TDS Water Quality Tester Material: ABS Color: White Test Items: Heavy Metals, Turbidity Power Supply: Button Battery CR2032 3V (not included) Test Range: 0‑9990ppm Measurement Accuracy: ±2% Package List 1 x TDS Water Quality Tester 1 x Manual