Specification: Net weight: 28g Error range: 2% Battery: 1.5V*2 (button battery) Battery life: 14.2*2.3*1.3(cm) Measuring range: 1-9990 PPM(999PPM or more automatic *10) About of this item Unique Temperature Compensation Function: Can automatically convert the TDS value at 25 water temperature TDS Value: Represents the total content of soluble substances in water, for example: calcium, magnesium ions and some trace elements etc. Large LCD display, waterproof design, easy to watch TDS value(can not test PH or certain d value 'a substance dissolved in the solution) More Accurate and Fast: Titanium alloy test probe, the measurement value is not affected by the magnetic field in the water, the measurement value is more accurate Energy Saving and Durable: Long using time without frequent battery replacement, normal use for two years (1.5V*2 button battery)