Description: To ensure that you are always drinking clean and safe water, a TDS meter tester is recommended for each family. Characteristics: The TDS meter tester can be used in: water purifiers and filters, monitoring the quality of food (vegetables, fruits) and drinks, swimming pools and spas, aquariums, hydroponics etc. Hold function: Stores measurements for convenient reading and writing. Auto-off function: turns the meter off after 10 minutes of non-use to conserve battery power. Press the "TEMP" button to move the temperature meter between degrees Fahrenheit and degrees Celsius. Measurement range: 0–9990 ppm, with a resolution of 1 ppm. From 1,000 to 9,990ppm, the resolution is 10ppm which is 5 x 10 images, factory calibrated. Applicable industries: water laboratories, CDC, aquaculture industry, hospitals, swimming pools, domestic water quality testing. Technical data: Shell material: plastic Main Color: Gray Range: 0 9990 ppm Accuracy: /- 2% Size: approx. 15.5 x 3 x 1.6 cm / 6.1 x 1.1 x 0.6 inch Package weight: 68g Please refer to the standard for water testing below 0 50ppm --------- High purity water 50 100ppm --------- Pure water 100 300ppm --------- Overall clean water 300 600ppm --------- Water will have incrustation scale 600 1000ppm --------- Bad tasting water Above 1000 ppm --------- The water is not potable Package includes: 1 x Water Quality Tester (without battery) 1. 2. Please be aware of: