BENETECH GT770 Split 3 in 1 Portable PH Meter Features: 1. Solution pH measurement 2. Solution temperature measurement 3. Sensor voltage measurement 4. Solution temperature compensation 5. Automaticmanual data recording with report generation 6. Data storage, viewing, and deletion 7. Adjustable sampling interval 8. Adjustable automatic shutdown time 9. Self-calibration, selectable 4.00-6.86-9.18 or 4.00-7.00-10.00 10. Temperature unit selection 11. Factory reset 12. Adjustable screen brightness 13. ChineseEnglish language selection 14. Low battery warning and battery level indicator 15. USB charging 16. Data transfer via PC software connection 17. Generates CSV and BMP files compatible with Windows systems; can also be used as a small-capacity storage device (USB flash drive) to store other file formats. Parameters: 1. pH Measurement Range: 0.00~14.00 2. pH Resolution: 0.01 3. pH Measurement Error: +-0.05 4. Temperature Measurement Range: 0~60 degrees Celsius (32~140 degrees Fahrenheit) Temperature Resolution: 0.1 degrees Celsius, Error: +-1.0 degrees Celsius 5. Voltage Measurement Range: -500~500mV 6. Voltage Resolution: 1mV, Error: +-3% 7. Solution Temperature Compensation Range: 0~60 degrees Celsius (32~140 degrees Fahrenheit) 8. Operating Environment: 0~50 degrees Celsius (32~122 degrees Fahrenheit) 9. RH less than 85% Storage Space: 8MB (can store approximately 397,000 data entries) 10. Battery: 3.7V 1000mAh Lithium Battery 11. Low battery warning: 4-level battery indicator; automatic shutdown when voltage drops below 3.3V. 12. Charging adapter: 5V2A 13. Dimensions: 160x65.35x35mm