A refractometer measures how light bends (aka refracts) as it moves between air and liquid. This gives us information about the properties of the fluid. The coffee measures the Total Dissolved Solids (TDS), allowing us to calculate the extraction yield (1). Easily analyze the thickness of each brew, whether it meets the SCA Gold Cup standard and calculate the extraction rate Specifications Range: 0~26% Coffee TDS For Pour Over / Espresso Measurement Accuracy: ± 0.03% Coffee TDS The test result is the most accurate when the sample to be tested is cooled to room temperature Distinguish：± 0.01% Coffee TDS Temperature Range: 5 - 45°C Battery: 350mAh (Charging time - 1 hour / Standby for 30 days) Charging: Type-C Charging Waterproof：IP67 (Dustproof / Water Depth 1m) Dimensions: 84*23*14.5mm Weight: 24g How to use Drop the liquid into the sampling tank with a dropper Press the power button to display the sampling results Features Download Difluid APP to connect through Bluetooth Annalyse data, record etc IP67 waterproof: Using ultrasonic welding technology, the gap can be more closely combined
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