Features:  7 In 1 Detecting Function: This multi-functional tester can test PH, total dissolved solids, EC, ORP, Salinity, S.G and temperature for you.  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％（±0.1％）5.10-25.00％（±1％）  pH:  Ranges: 0.01-14.00рH  Resolution: 0.01pH  Accuracy: ±0.05pH  ORP ranges: ±999mv  S.G ranges: 1.000-1.222  Operating Environment: 0~60.0°C (32.0-140°F), 100% relative humidity  Total dissolved solids factor: 0.4~1.0  Temperature ranges: 0.1-60.0°C (32.0-140°F)  Temperature accuracy: ±0.5°C  Temperature resolution: 0.1°C/°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)