1. Comprehensive 4-in-1 Water Testing: This 4-in-1 water tester combines a salinity meter, TDS meter, EC meter and temperature functions. It offers complete water quality measurement, ensuring a healthy environment for aquariums and other applications, meeting all your diverse testing needs. 2. Easy Operation and Quick Switching: Simply remove the digital PH tester's protective cap, immerse the electrode, and the button to measure. -button switching feature allows you to effortlessly manage your water quality, ensuring your drinking water is safe and healthy. 3. Portable and Versatile Application: Compact enough to fit in your pocket or bag, this TDS/EC/SALT/TEMP meter is ideal for outdoor use. It's perfect for water quality experts, adventurers, and campers, suitable for pools, labs, aquariums, and more, enhancing your healthy lifestyle. TDS: Range: 0-9999ppm; Resolution: 1ppm; Accuracy: 2% EC: Range: 0-9999 S/cm; Resolution: 1 S/cm; Accuracy: 2% SALT: Range: 0-9999ppm/10.1-100ppt/0.01%-10% Resolution: 1ppm/0.1ppt/0.01 Accuracy: 0-2000ppm @ 2% 2000-9999ppm @ 5% 10.1-100ppt @ 5% 0.01%-10% @ 5% Temperature range: 0.1-60/32.1-140 Temperature compensation: 0.1-60/32.1-140 Battery: 4x1.5V LR44(Not included) Please note:the physical slightly color difference or difference, does not affect the use, please do not mind, thank you! Colour:Blue Material:Plastic Package Contents: 1 * 4-in-1 TDS/EC/Salinity/Temperature Detector Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.