Easy to use, sturdy design, compact in size and light in weight, convenient to keep up and carry arround. With Built-in ATC (Automatic Temperature Compensation) from 10~30 degree Celsius. Soft Rubber eyepiece for comfortable viewing Equipped with scale measurement which provides direct reading Accurate testing results guaranteed Durable and bulit to last long Adjustable manual focusing Use ambient light only which means battery or power source is not required Easy and very convenient to use. Place a few drops of the liquid on the optical part of the refractometer, cover the prism (the liquid will spread more easily over the prism), look through the eyepiece against the light (focus, if necessary) and you will be able to read the result value on the scale. Measuring Range 0-80% v/v(VOL - alcohol volume percent). Widely used for scientific research, food producing, alcohol retailer, etc. Easy to focus & calibrate and very convenient to use. Measuring Range: 0~80%V/V Resolution: 1% Reference temperature 20°C Automatic Temperature Compensation (ATC: 10~30°C) Focus possibility Item Weight: 87g (3.07oz) Length: 160mm (6.30 inches) Packing include:1set EU Responsible Persons information: Name: PI NETWORK SARL Address:38 rue Dunois 75647 Paris CEDEX 13,75013,FR E-mail:friedlichrichter@outlook.com This merchant is committed to only offering products that comply with the General Product Safety Regulation.