The Oakton EcoTestr conductivity meter offers TDS - EC - and salt models which all feature a large - upright single-line display and 1% full-scale accuracy. The TDS model offers high (0 to 19.90 ppt) and low (0 to 1990 ppm) range meters. The EC model of the Oakton EcoTestr also offers high (0 to 19.90 mS/cm) and low (0 to 1990 µS/cm) ranges as well. The salt model offers a range from 0 to 10.00 ppt and a resolution of 0.1 ppt. All Oakton EcoTestr conductivity meters feature a durable two pin - stainless steel sensor with probe guard. Other features of the Oakton EcoTestr conductivity meter include a transparent protective cap which doubles as a container for on-site calibration - a click-lock battery compartment - push-button calibration and a hold function. Push-button calibration of the Oakton Instruments EcoTestr allows you to calibrate more precisely than a trimpot adjustment and does not require a screwdriver. The Oakton EcoTestr conductivity meters feature a waterproof - dust proof housing that meets IP67 standards and floats. Specifications: Salinity Range: 0.0 to 10.0 ppt; Salinity Resolution: 0.1 ppt; Salinity Accuracy: +/- 1% from 0 to 4.9 ppt - +/- 2% above 5 ppt; Temperature compensation: Automatic - 0 to 50ºC - 2% per ºC; Calibration: One-point digital calibration; Power: Four 1.5 V batteries (included) - >200 hours (continuous use) Applications: Aquaculture - Aquariums (marine fish) - Fish ponds (koi) - Food processing - Pools and spas - Environmental monitoring. Oakton #: WD-35462-50.