arr Instrument Company is a privately held corporation located at 211-53rd Street, Moline, Illinois, engaged in the design, manufacture and sale of laboratory instruments and apparatus for testing fuels and for conducting chemical reactions and tests under heat and pressure.

Parr reactors and pressure vessels include both standard designs and custom-built equipment in laboratory and pilot plant sizes. Uses for this equipment are found in a broad range of chemical, petrochemical, pharmaceutical and biotech research, development and control laboratories.

Parr calorimeters are used for testing a variety of solid and liquid fuels, foodstuffs and other combustible materials. Many unique designs and highly automated instrumentation have been added to its expanding lines of fuel testing instruments.