Features 1、Adjustable Result: This water quality tensting pen can be conveniently switched between Celsius and Fahrenheit. 2、Multi Function: This water quality tensting pen display water quality TDS, conductivity EC and temperature values at the same time. 3、Data Retention: This water quality tensting pen possesses the function of data retention, providing more convenience. 4、LCD Screen: This water quality tensting pen adopts large LCD screen, which is very easy and clear to read the value. 5、Wide Application: This water quality tensting pen is suitable for tap water, household water purifier, commercial water purifier, industrial water treatment industry, etc. Specification Item Type: TDS Meter Material: ABS Battery: 3V CR2032 x 1 (Battery Not Included) Uses: Tap Water, Household Water Purifier, Commercial Water Purifier, Industrial Water Treatment Industry, Etc Basic Parameters: Electrical Conductivity: 0-9999us/cm Celsius: 0.1-80.0℃ TDS: 0-9999 ppm Fahrenheit: 32.0 to 176.0℉ Package List 1 x TDS Meter 1 x User Manual 1 x Cloth Bag