1.ORP: Range: -999mV~+999mV Resolving power: 1mV 2.Temp: Range: 0.1°C-60.0°C; 32.1°F-140.0°F Resolving power: 0.1°C; 0.1°F Accuracy: ±0.5℃ 3.ORP Calibration: 256mV 4.Temp compensation (ATC): 0.1℃-60.0℃ 5.Work environment: 0.1℃-80.0℃; RH: max 90% 6.Waterproof grade: IP67 7.Battery: 3*1.5V (LR44) (not included); Low power warning 8.Size/weight: 187m*3*37mm (7.36*1.46*1.46in)/95g 9. Elestrode: Replaceable      1. pH Meter with Blue tooth: Powered by the YINMIK mobile App, professional measurement of ORP, and Temp. The mobile phone can control the backlight. Drinking water, Aquarium, Fish Tank, Swimming Pool, Farmland irrigation, Laboratory Etc. 2. Cloud Based Data Management System: Precision real-time Blue tooth data transmission, Synchronize save time and data record, Share data or print excel tables, the mobile phone can view the calibration record. 3.Automatic Calibration ORP Tester: With high sensitive replaceable probe, easy to operate, can measure -999mV~+999mV, accurate to 1mV, automatically calibrate ORP. 4. ORP Meter with Automatic Temperature Compensation: Temperature can affect reading levels, digital pH tester has an even better range of 0.0°C-60.0°C (32.0°F-140.0°F), automatic temperature compensation can ensure that you are getting the best reading, so you can test with confidence in any environment. 5. High Accuracy Water Tester: High-accuracy algorithm chip and electrode of our digital water quality tester ensure an accurate and fast response. EU CE certification, Chinese / English switching, backlit LCD design, read the measurement results at any time. One key to lock the reading function, you can view the data at any time. Can be set to automatically/manually save data. It can detect water data changes for a long time, and automatically set the time interval for recording measurement results. You can set the maximum and minimum values. When the measurement result is not within the set range, the value will be displayed in red. 6.ORP meter, also known as redox potential online analyzer, is an instrument that is widely used in industry and experiments; ORP is a comprehensive indicator of the environmental conditions of the medium (including soil, natural water, culture medium, etc.), which characterizes the oxidation of the medium The relative degree of sexuality or reducibility. ORP (oxidation reduction potential) is an important indicator of water quality. Although it cannot independently reflect the quality of water, it can integrate other water quality indicators to reflect the ecological environment in the aquarium system.