Dual range: measures from 0 to 999 ppm with a resolution of 1 ppm. Measures from 1000 to 9990 ppm, resolution is in 10 ppm increments, displayed by a flashing x10 image. Hold function: saves measurements for easy reading and saving. Press the TEMP button to switch the temperature display between Fahrenheit and Celsius. Handheld tester with LCD display: 5 seconds to know water quality - Both testers with LCD display are suitable for indoor and outdoor use. Fast and accurate: the gauge can make a quick measurement by pressing a button. Without the use of color cards or messy test strips, the meter can obtain fast and accurate results. Multiple applications: testers are used to test the quality of liquids such as water drinking water, aquariums, swimming pools, spas, fountain water, etc. indoors or on vacation, which can ensure water safety in daily life. Mesee Water Quality Tester with High Accuracy - Water pH Tester for Water drinking, swimming pool, aquarium, swimming pool and laboratory. Features: Product dimensions: 14.2 x 2.3 x 1.3 cm. Weight: 60 g. TDS measuring range: 0 ~ 9999 ppm. Conductivity: 0 ~ 9999 us / cm. Accuracy 2%. TDS 0 ~ 9999 ppm. luckymeet