WIFI connection and data transfer,Download Tuya Smart APP and enter your account. Real-time monitoring is achieved on your mobile phone. Switch the phone language and region to automatically convert different recorded data on the APP. Mobile application monitoring,PH-W218 is a 24-hour online monitoring tool. The APP is compatible with Apple and Android systems. Range: pH: 0.00-14.00pH ORP: -2000mv- + 2000mv EC: 0-19000us/cm 0-199.0 ms/cm CF: 0-1999.0CF TDS: 0-19990ppm 0-199.0ppt SALT: 0-199.9ppt 0%-20% S.G:0.990-1.400 Temp: 0-50°C(32°F-122°F) Plug Type:EU Plug,it applies to Indonesia, Germany, France, Spain, Italy and so on. Plug Type:US Plug, it applies to Canada, India, Mexico, Thailand, Taiwan, the United States, the Philippines and so on. Plug Type:UK plug,it applies to Malaysia, the United Kingdom and so on. voltage-Plug Type: AC110V-US plug / AC100-240V-EU plug / AC230V-UK plug Colour:As Shown Material:ABS Tips: The product may be updated constantly ,Due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does Not Affect Use Package Contents: 1 * Water Quality Tester 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.