Durable and built to last long Uses ambient light only which means battery or source is not required. Heavy-duty and lightweight with its aluminum construction. Equipped with scale measurement which provides direct reading, easy to focus and calibrate. Specification: Ethylene Glycol: -50C - 0C Propylene Glycol: -50 degrees Celsius - 0 degrees Celsius Cleaning solution: -40 degrees Celsius - 0 degrees Celsius Battery Fluid: 1100 - 1400 seconds Resolution factor Ethylene glycol: 5 degrees Celsius Propylene Glycol: 5 degrees Celsius Cleaning solution: 5 degrees Celsius Battery fluid: 0.01sg Reference temperature: 20 degrees Celsius (Automatic Temperature Compensation) Compensation range: 10 degrees Celsius ~ 30 degrees Celsius (50 degrees Fahrenheit ~ 86 degrees Fahrenheit) Provides manual calibration using a mini screwdriver Weight: 165g Material: Aluminum Color: as pictured Package Contents: 1 * Portable Refractometer 1 * Mini screwdriver 1 * Straw 1 * Soft Case 1 * English user manual Only the above package content, other products are not included. Note: Light 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.