Multi-functional: Provides accurate and reliable test readings; 3-in-1 digital tds meter provides accurate readings for TDS (total dissolved solids) EC (electrical conductivity) and temperature Useful Tool: Saves you money while protecting your health; Home water test kit alerts you when its time to change filters to remove contaminants from your water Easy to Use: Locks your reading making it easy to record; Large, easy to read LCD screen and data-hold function makes reading and recording a snap Long Battery Life: Auto-off function saves on battery usage and our TDS meter has lower power consumption than HM TDS meter Measurement Range: 0-9990ppm, 0-9990s/cm; Accuracy: 2%, 0.1- 80.0C, 32.0-176.0F.; Factory calibrated; Automatic temperature compensation