1. The product can be mounted on wall with the Sucker, so you don't need to hand held it, more convenient. 2. WIFI Connection: download app to view current and historical data abnormal high and low data alarm, etc. on the mobile phone 3. Bluetooth APP Real-time viewing: Record data for a long time to facilitate comparison and analysis and formulate solutions 4. Real-time data transmission: You can view daily, weekly and monthly data, easily grasp the water quality 5. APP Alarm Settings: Create a smart scene in the Tuya APP, set the security range,. and select the alarm method, out of the safe range, send a notification reminder High precision probe: Corrosion resistance, long service life, good responsibility, fast response, and more stable data Personal Setting: you could set your own alarm value and record frequency and so on. Wide Range of Application: it can be widely used for Fish Tank, Aquarium, Mariculture, Swimming Pool, Drinking Water, Laboratory, Fish Pond, Aquarium, Drinking water, Fish Pond, Aquarium, Fish Tank Specification: 1. Model: YY-W9909 2. PH: 0.00-14.00 pH 3. TDS: 0-19990 ppm; 0-199.0 ppt 4. EC: 0-19000us/cm; 0-199.0ms/cm 5. SALT: 0-199.9 ppt; 0%-20% 6. S.G: 0.990-1.400 7. Measuring range of Temperature: 0°C-50.0°C ; 32°F-122°F Plug Type:EU Plug,it applies to Indonesia, Germany, France, Spain, Italy and so on / US Plug,it applies to Canada, India,Mexico, Thailand, the United States, the Philippines,Taiwan and so on. With Backlight Or Not:YES Is Smart Device:YES Display Type:DIGITAL color:White + green Material:Metal + Plastic Voltage: AC100-240V Package contents: 1 x Water Quality Tester 1 x power plug Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.