Instantly READ: Displays TDS value instantly after immersed in liquid. Freze the measurement for easy water reading Multi-function: Combines TDS meter, EC meter and temperature meter in one ergonomically designed pen. be tested ppm, electrical conductivity, temperature Celsius and Fahrenheit. Save money and hassle - you can get reliable results from home. This PPM meter can also be taken anywhere with you in the free leather case, ready to test on the go. Three-in-one test function: Advanced three-in-one conductivity pen (TDS, EC, temperature), this tester can not only detect TDS, but also EC and temperature in water. Simple and convenient operation: Simply turn on the TDS water meter and gently stir the water, the stable reading will be automatically locked on the LCD screen within seconds. TDS Functionality: 0-9999 ppm Conductivity: 0-9990 s/cm Temperature Range: 32-176°F and 1-80°C. Conversion Factor: NaCl Auto Data-Hold: Lock and Save Readings Function 'auto-off for extended battery life Package including: 1* detecting dip pen