A Copper Corrosion Tester measures the corrosivity of hydrocarbon liquids. It is a subjective test based on the discoloration and corrosion of a copper coupon under standard test conditions when compared to a series of ASTM standards. The test is performed to ensure that a grease will protect the metal surfaces it comes in contact with over time. It is a widely used oil analysis method for gearbox, turbine and hydraulic lubricants. These are made available by us in various types. The Copper Corrosion Tester is very effective and accurate. The tester is very easy to use.