• Multifunction: Combines TDS meters, EC meter, and temperature meter in an ergonomic pen-type design. It can measure ppm, electrical conductivity, temperature in Celsius and Fahrenheit. • Smart Design: Includes backlighting, automatic lock function, large screen for easy reading, automatic temperature compensation, and automatic shutdown in 2 minutes to protect the battery. • Automatic Lock Function: Allows automatic locking of the reading to facilitate recording after obtaining the result in seconds. It can also be locked manually by pressing 'HOLD'. • Accurate and Portable: Measurement range from 0 to 999 ppm with a resolution of 1 ppm. From 1,000 to 9,999 ppm, the resolution is 10 ppm. High-precision sensor that completes the measurement in 5 seconds. Pocket size and long battery life. • Wide Application: Ideal for testing tap water, filtered water, distilled water, bottled water, well water, and refrigerated water. Used in water quality testing, water purification, aquaculture, hydroponics, pools, spas, colloidal silver, and water treatment.