Foot Files features: Handheld refractometer sugar concentration meter densitometer 0‑50% sugar tester meter brix tester portable refractometer Color: we send based on the color or size of the main image of the product page. Quantity：we send based on quantity on title, if there is no quantity in the title, we send based on description. Condition: 100% wonderful Item Type: Sugar Tester Meter Material: Plastic + Stainless Steel How to use: Open the cover and wipe the prism carefully with a soft cloth. Take a few drops of the solution to be measured and place them on the prism. Gently close the cover plate to avoid bubbles and make the solution spread all over the prism surface. Aim the instrument at the light source or bright place, observe the field of view through the eyepiece, turn the eyepiece to adjust the hand wheel, make the blue and white dividing line of the field of view clear. The scale value of the boundary is the concentration of the solution. Measurement Range: 0-50% Packing list Package List 1 x Sugar Tester Meter 1 x Plastic Dropper 1 x Double-Sided Flannel 1 x Screwdriver 1 x Manual