you are interested in this product, come and have a try, it will not let you down. IP67 Waterproof: IP67 waterproof grade ensures the normal use of the product inserted into the water in a short time, and can effectively avert dust. Detachable Probes Design: The probe is detachable and you can change the probes by yourself if it was broken. Wide Applications: This product has a wide measurement ranges and can measure both freshwater salinity and sea salt. It is a digital water quality monitor for homes, swimming pools, drinking water as well as aquariums. Large LCD Display Screen: Adopt large LCD display screen for you to read the detecting data more clearly. ATC Data Hold Functions: Automatic temperature compensation function and data hold function can help you to get the more accurate data. Specifications: Material: plasitcs Type: (Optional) Type1: display without backlight Type2: display with backlight EC: Accuracy: 2% F.S. Total dissolved solids: Ranges: 0-10000ppm, 1000ppm-10000ppm, 10.1-200.0ppt Resolution: 1ppm, 0.1ppt Accuracy: 2% F.S. Salinity: Ranges: 0.00%-25.00% Resolution: 0.01% Accuracy: 0.01-5.00 #xff05; #xff08;0.1 #xff05; #xff09;5.10-25.00 #xff05; #xff08;1 #xff05; #xff09; pH: Ranges: 0.01-14.00H Resolution: 0.01pH Accuracy: 0.05pH ORP ranges: 999mv S.G ranges: 1.000-1.222 Operating Environment: 0~60.0C (32.0-140F), 100% relative humidity Total dissolved solids factor: 0.4~1.0 Temperature ranges: 0.1-60.0C (32.0-140F) Temperature accuracy: 0.5C Temperature resolution: 0.1C/F Power: 3 * LR44 battery (NOT INCLUDED) Package size: 240 * 80 * 50mm / 9.4 * 3.1 * 2.0in Package weight: 170g / 6.0ounce Packing list: 1 * Water Quality Tester (Optional)