BLE-9909 Water Quality Pen: 3 in 1 Bluetooth PH/TDS/EC/Salinity/Temperature with Backlight1. Multi-function meter with Bluetooth: intelligent mobile phone APP control, mobile phone full-screen multi-parameter display, professional PH/TDS/EC/salt and temperature measurement. The mobile phone can control the backlight. Drinking Water, Aquarium, Fish Tank, Swimming Pool, Farmland Irrigation, Laboratory, Etc. 2. Cloud-based data management system: Bluetooth real-time precision data transmission, time and data record synchronization, data sharing or excel chart printing, mobile phone can view the record calibration.3. Auto Calibration Tester: with replaceable high sensitive probe, easy to use, automatic pH calibration, two sets of calibration points are optional 4. Multifunctional meter with Auto Temperature Compensation: temperature can affect reading levels, the digital pH tester has an even better range of 0.0C-60.0C (32.0F-140.0F), automatic temperature compensation can ensure you get the best reading, so you can test confidently in any environment (4.0+6.86+9.18/4.0+7.00+10.00).5. High precision water tester: The high precision algorithm chip and electrode of our digital water quality tester ensure accurate and fast response. EU CE certification, Chinese/English switching, backlit LCD design, reading measurement results at any time. One key to lock the read 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 adjust the time interval to save the measurement results. You can set the maximum and minimum values. When the measurement result is not within the set range, the value is displayed in red.1. Model: BLE-9909 2. PH: 0.00-14.00 3. TDS: 0-9999ppm; 10.1-200.0 ppt 4. Ce: 0-9999us/cm; 10.01-19.99mS/cm; 20.1-400.0 ms/cm 5. Salt: 0.01-25.00%; 0-9999ppm; 10.1-200.0 ppt 6. Temperature: 0.1-60.0C; 32.1-140.0F 7. Two sets of calibration points are optional: 4.0+6.86+9.18/4.0+7.00+10.00 8. ATC: 0-60.0C; 32.0-140.0F 9. Working environment: 0.1-80.0; RH: max 90% 10. Waterproof grade: IP67 11. Size: 187m*3*37mm (7.36*1.46*1.46 inch) 12. Power mode: 3*1.5V battery (not included), low battery warning 13 .Weight: 95g 14. Packing List: 1 * BLE-9909 Bluetooth PH/TDS/EC/Salinity/Temperature Water Quality Pen