with high quality and good price. For checking TDS/salt (NaCl) levels in freshwater aquariums, ponds, and water purification systems. 3-in-1 smart pen combines TDS, EC, and a temperature meter for improved accuracy. With automatic temperature compensation and a measuring range of 09999 ppm 2%. 4 display modes: Press SHIFT button to switch between TDS - ppm & Celsius, EC - s/cm & Celsius, TDS - ppm & Fahrenheit, EC - s/cm & Fahrenheit. Lock function for easy reading and recording; press HOLD button then remove from test solution. The instrument will automatically shut down after 5 minutes of inactivity. Conductivity: 09999 s/cm TDS: 09999 ppm Temperature range (Celsius): 0.180.0 C Temperature range (Fahrenheit): 32.0176.0 F Resolution: TDS: 1 ppm; EC: 1 s/cm Battery: 1 x 3.0V (CR2032) Accuracy: 2% Color: White Material: Plastic Size: 152 x 30 x 14 mm Package Contents: 1 x TDS & EC Meter Only the above package content; other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture to vary slightly from the real thing. Measurement allowed error is 13 cm.