General description The 7 in 1 professional water quality tester with a bright screen is ideal for various applications including drinking water, aquariums, swimming pools, laboratories, water regulation, reverse osmosis, cooling towers, wastewater, agriculture, aquaculture, hydroponics, and the beauty industry. This device is extremely simple and intuitive to use. Technical specifications Dimensions: 183 x 37 mm Weight: 130 grams Waterproof rating: IP67 Battery requirement: 3 x LR44 (AG13) 1.5V batteries (not included) Measuring parameters: salinity, pH, total dissolved solids (TDS), electrical conductivity (EC), oxidation-reduction potential (ORP), specific gravity (SG), and temperature Food salinity measurement range: 0.01-25.00% Seawater salinity measuring range: 10.1-200.0 ppt pH value range: 0.01-14.00 Operating environment: 0 to 60.0 °C (32.0-140 °F); 100% relative humidity Usage Automatically stops after 5 minutes Features a HOLD function to lock the measured value Low battery indicator Automatically compensates for temperature variations affecting pH Factory calibrated, but can be recalibrated if desired Other information Includes a manual with illustrations and 4 envelopes of calibration solution for recalibration