Oil varnish deposits cause major problems in turbines and other industrial equipment, from hurting system performance and reducing system life cycles to destroying key parts and causing costly, unplanned shutdowns. Membrane Patch Calorimetry(MPC) testing has already been globally adopted as most common methodology for testing the varnish potential for lubricant fluid. Our portable MPC test kit for varnish potential determination with according to the outlined procedure in ASTM D7843.