100% new with high quality and good price.<br> For checking TDS/salt (NaCl) levels freshwater aquariums, ponds and water purification systems.<br> smart pen combines TDS, EC, and a temperature meter for improved accuracy.<br> With an Automatic Temperature Compensation and the measuring range of 0-9999 ppm +/- 2%.<br> 4 Display modes: SHIFT button: TDS - ppm & Celsius, EC - s/cm & Celsius, TDS - ppm & Fahrenheit, EC - s/cm & Fahrenheit.<br> Lock function, easy to read and record, HOLD button then remove from test solution.<br> The instrument automatically shut down after 5 min of inactivity.<br> Conductivity: 0 - 9999s/cm<br> TDS: 0 - 9999ppm<br> Degrees Celsius: 0.1 - 80.0 Celsius<br> Fahrenheit: 32.0 - 176.0 Fahrenheit<br> Resolution: TDS: 1ppm; EC: 1s/cm<br> Battery: 1x3.0V (CR2032)<br> Accuracy: 2%<br> Colour:White<br> Material:plastic<br> Size:152 x 30 x 14mm<br> Package Contents:<br> 1 x TDS & EC Meter<br> Only the above package content, other products are not included.<br> Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.