Range PH:0.00-14.00PH ORP:-2000mv-+2000mv EC:0-19000us/cm.0-199.0ms/cm CF:0--1999.0CF TDS:0~19990ppm0~199.0ppt SALT:0~199.9ppt0%~20% S.G:0.990~1.400 Temp:0-50(32F-122F) Resolution PH: 0.01PH ORP:1mV EC:1us/cm(<1999).10us/cm(>1999)<0.1ms/cm CF: 1CF TDS:1ppm(<1999)10ppm(>1999)0.1ppt SALT:1ppm(<1999)10ppm(>1999)0.1ppt S.G:0.001 Temp;0.1(0.2F) Accuracy PH:+0.03 PH ORP:+5mv Temp;1.0(2 ) EC/CF/TDS /SALT:2% F.S Operating Temperature:0~50 Temperature Compensation :0~50 Power Supply : DC6V Dimensions:152 mm x80 mm x 26 mm 1)With data logger function --The data supports exporting to the mailbox, and you can view the data of the day, week, and month. Focus on: It is no problem to connect 20 devices to a mobile app at the same time. The app will be automatically named device 1, device 2,device 3.... just open the page to see which device data Notice: One device can only connect to one mobile phone in the same network. If you want to connect to another mobile phone, remember to delete the device in the app on the originally connected mobile phone. Otherwise, other mobile phones will not be able to search