Optical Hydrometer Alcohol Refractometer (0 80% v/v) for Distilled Spirits, Content Measurement Meter in Liquor Products Not Suitable Beer or Wine

【Easy to Use】— Place 2 - 3 drops of liquid sample onto the prism of this hydrometer, then look through the eyepiece to get the reading directly. NO test jars needed, NO measuring or calculating work needed, operating easily spirits refractometer, convenient to use and save your time.