Features: 1. Test the COND (Conductivity) / TDS (Total Diolved Solid) level and temperature ( / ) of the water. 2. Pocket size, lightweight and portable with backlight and large LCD screen for clear and easy reading. 3. With Replaceable Sensor Probe - The electrode probe can be replaced with an insert type design for quick and convenient replacement. 4. ATC (automatic temperature compensation) function and automatic calibration. Apply in water sources, without soil, cultivation, aquarium, hydroponics, laboratory, spas, environmental water, swimming pools, water purification systems, etc. 5. Made of high-quality materials, it is durable and practical. Description: Apply in water sources, without soil, cultivation, aquarium, hydroponics, laboratory, spas, environmental water, swimming pools, water purification systems, etc. Specifications: Measurement range conductivity :0 us-1999 u TDS measuring range:0ppm-1999ppm Measurement error:3% FS+/-1 digit Temperature accuracy:1C Temperature compensation solvent0-60C ScreenLarge segment type LCD display Measurement range conductivity:2.00 ms-19.99 m TDS measuring range:0pppt-0.01mS Repeatability:1us/0.01mS Power supply:LR44 battery*4pcs(not included) Automatic on/off:ye Working temperature range:0-50C Package Included: 1 set * Water Quality Meter (battery not included) Notes: 1. Please allow 0-1 inch error due to manual measurement. Thanks for your understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from real object.