The TDS Water Tester is a compact device designed for measuring the water quality of drinking water. It has a maximum supported water TDS level of 999 ppm and is equipped with a digital display for easy reading. The meter is powered by a battery and has an NSF certification, ensuring reliability and accuracy in testing. With its sleek blue design and included LR44 batteries, this TDS water tester from zerowater is a convenient tool for maintaining clean and safe drinking water.