Dual meter is designed to measure the salt content in liquid without the need for conversions. It measures both temperature (C/F) and salinity (ppt) and display simultaneously on its clear LCD. It has an IP65 Rating, waterproof and dustproof housing and waterproof membrane keypad. Applications and Usage: It quickly and accurately measure salt concentration in ponds. Ideal for checking salt in fish tanks and tropical aquariums, water monitoring, aquariums, holding tanks and more Features: Builtin NaCL Temperature coefficient Conductivity to TDS conversion factor Multi point calibration guarantees full range accuracy Allow factory default resetting With over and below the limit value indicator Low battery indicator Self diagnostic for error messages Specifications: Measuring Range: Salinity: 0.00 to10.0 ppt (NaCL) and 10.1 to 70.0ppt (NaCL) Temperature Compensation: 0 to 50C Accuracy: Salinity: 1 percent Full Scale 1 digit or 2 Full Scale 1 digit (10.1 to 70.0ppt) Temperature: 0.5C Resolution: Salinity: 0.01ppt or 0.1ppt Temperature: 0.1C/F TDS Factor: Builtin NaCL conductivity to TDS conversion factor Builtin NaCL Temperature coefficient Normalization Temperature: Fixed at 25C Operating Temperature: 0 to 50C Power Supply: 4 x 1.5V button batteries (last up to 80hrs continuous work) Auto power off if idle or no operation for 20 minutes Set Includes: 1 x Salinity and Temperature Meter 4 x 1.5V Button Batteries English Quick Start Guide Standard packaging box