Alcohol Refractometer for Spirit Alcohol Volume Percent Measurement with Automatic Temperature Compensation (ATC), Range 0-80% v/v.

Salinity Refractometer for Seawater and Marine Fishkeeping Aquarium 0-100 PPT with Automatic Temperature Compensation

Antifreeze Refractometer Displaying in Fahrenheit for Checking Freezing Point of Automobile Antifreeze Systems and Battery Fluid Condition. Battery Acid, Glycol, Coolant, Antifreeze Tester

Agriculture Solutions Univent Automatic Vent Opener Standard - Lifts 15 Lbs

Agriculture Solutions Gigavent - Automatic Greenhouse Vent Opener up to 65 Lbs