1.It's designed for testing the suger content and specific gravity of liquid. 2.Perfect Brew, Wine making, Agricultural, Gardening & Educational Purposes. 3.Consistently accurate readings of 0-32% Brix and 1.000-1.120 Specific Gravity. 4.Automatic Temperature Compensation makes it even easier to fast results. 5.Durable and Easy to Use & Carry -- The main part is made of chromium, it's light durable. Material: Metal colour: As shown Package Contents: 1 x screwdriver 1 x cleaning cloth 1 x straw 1 x refractometer box Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.