Smandy Digital TDS Tester Water Quality Purity TEMP/PPM Testing Meter Portable TDS Total Dissolved Solids Meter Pen for Household Drinking Water Hydroponics Aquarium Swimming Pool(without Battery)

【Widely Used】-- The TDS meter can be used in : water purifiers and filters, widely used for food processing (vegetable, fruits), drink quality monitoring, aquarium, fish hatcheries, laboratory, schools, colleges, swimming pools, etc.Package Included: 1 * TDS Tester 【Usage】-- Our PPM tester pen can test the impurities in water such as some elements of soluble salts, ionic organic compound, heavy metal ion, etc, help you drink the safe and pure water, protect your health. Check the performance of your water filter and the hardness of the water you drink. 【Measuring Principle】-- TDS meter measuring principle is to measure the electrical conductivity of water and indirectly reflects the TDS value. 【Automatic Power-off】-- Automatic power-off function allows it to power off after 5 minutes without any in order to save power. Weight: Approx. 70g 【Hold Function】-- It supports hold function that can save measurement results for easy reading and record.Size: Approx. 15.5*3*1.8cm/6.1*1.18*0.71in, Weight: Approx. 70g