5 in 1 Water Quality Tester The digital pH tester measures TDS, pH, salt content, EC, and temperature. TDS measuring range: 0-1000 ppm. EC measuring range: 0-10000 S/cm. pH measuring range: 0.01-14.00 pH. Salinity measuring range: 0.00-25.00%. Includes temperature conversion function. High Accuracy Advanced algorithm chip and electrode ensure accurate and fast readings. Long press the HOLD/TEMP button to lock the value when stable for easy viewing. Dual Salt Content Measurement Measures salt content in food from 0.00% to 25.00%. Also measures salinity in seawater from 10.1 to 200.0 ppt. Auto-Off Function and Large Backlit Display Equipped with a backlit LCD screen for clear visibility in any lighting condition. Displays 4-digit values with corresponding units. Auto-off feature powers down the device after 5 minutes of inactivity to conserve battery life. Automatic Temperature Compensation Compensates for temperature variations between 0C and 60C (32F to 140F), ensuring reliable and consistent measurements in diverse environments. Note: Instructions are available on the product detail page. Please scroll down to view them.