Specification Item Type: Coffee Concentration Tester Weight: Approx. 113g / 3..99oz Range: 0~26% coffee TDS Accuracy: ±0.03% coffee TDS Resolution: 0.01% coffee TDS Temperature Range: 5-45℃ Capacity: Lithium ion battery 350mAh (delivered with built in battery) IP Protection Level: IP67 Product Size: 84x23x14.5mm/3.31x0.71x0.57in Suitable For: Measurement of coffee concentration Measurements: 1. Click Start 2. Drop into the liquid to be tested (it needs to pass through the bottom prism completely) 3. Single node button for detection 4. Display the test result Calibration: 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 state 4. TDS should be 0 after calibration APP connection: 1. Open the APP and select scan code to connect the device 2. Scan the QR code on the back of the machine to connect to the APP Package List 1 x Coffee Concentration Tester 1 x Bag 1 x Sling 1 x USB Cable 1 x Specification 1 x Dropper 1 x Wiping Cloth Note 1.Clean and wipe the liquid tank before and after measurement. 2.Use liquid in an environment between 5°C and 45 °C for measurement. Deviation will occur if the temperature is beyond this range. 3.Drops of liquid cover the bottom prism. 4.If the deviation is too large, it is recommended to use water calibration. 5.Before charging, ensure that the device interface is dry.