
In order to calibrate it, you test RO or distilled water, and use the screwdriver to set it to zero. The screw is under the little black cover in the middle.You drop some water on the end, look through the eyepiece, and twist until the line shows your specific gravity.very happy with this. sturdy construction and easy to read. mush faster to use and clean than either glass or swing arm hygrometer (and more accurate)Simple, accurate and effective in a professional looking, secure box. All at a low price. What more could you want?Quick shipping, received today. All was as described. Came with hardcase, dropper, adjustment driver, and cleaning cloth. One thing is true, as another reviewer stated it does take a bright light source to read. Not a big deal at all in the daylight, but if you need to do an emergency mix or water change at night you will need a powerful little LED flashlight or similar. Even so, 5 starsespecially considering the price.
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