【Specifications】: Measuring range: 0~25%; Refractive index range: 1.3330~1.4200; Storage temperature: 0~40℃/32 - 104.0°F; Resolution: Concentration 0.01%, Refractive index 0.0001; Dimensions: 4.76 x 2.28 x 1.37 inches (121 x58x 25 mm). 【Accurate and consistent】: The refractive index is affected by temperature, so we set up an infrared temperature sensor to ensure a more accurate compensation (ATC) function, which is suitable for coffee production, coffee chain coffee teaching and sales and other places. 【Large color screen with backlight】: The device is equipped with a high-definition color screen, bid farewell to black and white, and the color reading is clearer. It supports backlight function, and the reading can be clearly read even in low light environments. 【Convenient and fast】: Just turn on the coffee tester, drop a few drops of coffee in the metal sample slot, press the "Read" button, and the large screen interface will display the results in less than 3S. The operation is very simple. 【Ten consecutive tests】: After placing the liquid, press and hold the measurement key (READ) for three seconds for ten consecutive tests. After the continuous test, the average value (AVER) is displayed. After 10 consecutive tests, the average value is more accurate.