100% brand new and high quality Feature: This TDS water quality testing pen is waterproof, has fast response and accurate measurement. Light and portable: lightest weight, portable TDS instrument device. Wide measuring range: with the measuring range of 0 to 990PPM. Wide application temperature: working at 0-60, it can be stored at -30. Long battery life: large capacity battery, can be used more than 5 years. Reasonable design: the electrode at the pen end can be directly inserted into the mouth of the drinking water bottle for measurement, and the pen cover can also be used as the container for the measured liquid, which is extremely convenient for use. Fast measurement: due to the delicate and bare sensor element, one measurement can be completed in 5 seconds. Easy to clean: the protective cover of electrode can be pulled out for cleaning probe and sheath. Automatic temperature compensation: it can automatically convert the display value to the display value at 25. Automatic shutdown. Specifications: Item Type: Water Quality Tester Material: plastic Size: 16.2x2.9x1.5CM/6.3x1.1x0.5in Color: Yellow, White, Green(Optional) Measuring Range: 0 ppm-9999 ppm Temperature Range: 0-99/32-212 Power Supply Voltage: CR2032 Battery, DC3V 230mAh Conductivity: 0s/cm-9999s/cm Using Environment: 0-50/32-122 Max Relative Humidity: 95% Accuracy: minus or plus 2% F.S Quantity: 1 PC Using Method: 1.Take off the pen holder and turn on ON switch. 2.Put the pen on the testing solution liquid with the height of no more than 4cm(from the pen end). 3.Gently stir with the pen until the number is stable. 4.After using, scrab water on the pen with cloth and then put in on the pen cover. Note: No retail package. Transition: 1cm=10mm=0.39inch Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you Package Includes: 1 x Water Quality Tester 1 x Pen Storage Holder