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