Durable and built to last longUses 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 - 0CPropylene Glycol: -50 degrees Celsius - 0 degrees CelsiusCleaning solution: -40 degrees Celsius - 0 degrees CelsiusBattery Fluid: 1100 - 1400 secondsResolution factorEthylene glycol: 5 degrees CelsiusPropylene Glycol: 5 degrees CelsiusCleaning solution: 5 degrees CelsiusBattery fluid: 0.01sgReference 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 screwdriverWeight: 165gMaterial: AluminumColor: as picturedPackage Contents:1 * Portable Refractometer1 * Mini screwdriver1 * Straw1 * Soft Case1 * English user manualOnly 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.