Feature:1. 2 Second Speed Measurement: With high accuracy and speed, starting up by a single button, you can test by dripping, the results immediately intuitive display.2. Type C Intelligent Quick Charging: Built in 350mAh lithium battery, charging fast. You can use coffee concentration tester more freely and safer3. Connection or Mobile monitoring: The original biological networking small APP covers data analysis model, services, sharing social and other multi dimensional functions.4. Good Performance: Though professional manufacturing and superb craftsmanship, the coffee concentration meter pormotes the performance which is best and stable.5. Elaborate Design: Coffee concentration with range of 0‑26%, its accuracy is ±0.03% coffee TDS. The tester is waterproof and battery operated.How to Use:Measurements:1. Click Start2. Drop into the liquid to be tested (it needs to pass through the bottom prism completely)3. Single node button for detection4. Display the test resultCalibration:1. Click the button to power on (startup interface)2. Drop into the coffee boiling water (completely up to the bottom mirror)3. Short press and long press to display calibration to enter the calibration state4. TDS should be 0 after calibration APP connection:1. Open the APP and select scan code to