Equipped with scale measurement which provides direct reading. Extremely easy-to-use and calibrat.Adjustable manual focusing. Uses light only which means battery or power source is not required.Measuring range: 0 - 32% Brix. Reference Temperature: 20degC.(Automatic Temperature Compensation) Compensation Range: 10C~30C (50F~86F).Manual calibration with mini-screw driver provided. Type : refractometer. Wort S.G.1.000-1 .120sg. One SCALE: Brix scale: 0~32%Brix;. Reference Temperature: 20C How to operate: 1. Align the Cover Plate with light, adjust the Focus Adjustment until you see the scale clearly. 2. Calibration: Measurement depends on careful calibration. Please make the temperature is about 68 degF, distilled water can be used to calibrate. A. Open the Cover plate. place 2-3 of the distilled water on the , then the cover plate and make the water spread aross the without any air bubbles or dry spots. wait for about to let the reading to stabilize. Look into eyepiece and turn the calibration screw with the screw driver until the reading is "0" 3. Clean the with soft cloth, then place 2-3 of the liquid sample to be tested on the .then the cover plate and make the water spread aross the without any air bubbles or dry spots. wait for about to let the reading to stabilize. Align the assembly with the . look into eyepiece and you can the reading. 4. Please keep the refractometer dry and clean in , which can make the reading accuracy and durable. Colour:black + silver Material:Plastic + Metal Size:70 x 40mm Package Contents: 1 x Brix meter 1 x Pipette 1 x Screw driver 1 x Cleaning cloth(random colors, 't acceptthe specified color) 1 x Storage Box Only the above package content, other are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.