XLUX Digital TDS Meter, Water Quality Tester, 0-9990 ppm Measurement Range, 1 ppm Resolution, 2% Readout Accuracy WARRANTY-- 18 months after the date of purchase, we take care of all quality-related issues with a REPLACEMENT or REFUND - INSTANTLY READ--Shows the TDS value instantly after immersed into liquid - HOLD FUNCTION: Freezes the measurement for easy read out of the water - AUTO-OFF: the meter shuts off automatically after 6 minutes of non-use to conserve batteries - TEMPERATURE MEASUREMENT: shows the liquid temperature in C and F