Specification:

Measuring Range: 0-80%W/W
Minimum Division: 1%W/W
ATC Compensation Range: 10°C~30°C (50°F~86°F)
Durable and built to last long
Uses ambient light only which means battery or power source is not required
Heavy-duty and lightweight with its aluminum construction
Easy to focus and calibrate
Accurate testing results guaranteed
Made with the highest and finest quality of aluminum & rubber that makes it lightweight
Cushioned with soft & comfortable non-slip rubber
Extremely easy-to-use and calibrate
Equipped with Built-in ATC compensation Range (Automatic Temperature Compensation) from 10° to 30°C to correct temperature discrepancies during use

The need to consult temperature correction charts is eliminated with the built-in 10-30°C ATC. The unit also comes with a manual calibration knob that is secured with a lock nut and has a brighter display than the more narrow range refractometers.