A. R. Engineering Works manufactures Pin Fin Apparatus for Determining Heat Transfer Co-efficient. A. R. Engineering Works manufactures condensing unit, laboratory condensing unit, experimental condensing unit, motorized gyroscope, absorption refrigeration chiller, air conditioning [1 ton], air water heat pump, drop and film condensation apparatus etc. The Pin Fin Apparatus for Determining Heat Transfer Co-efficient are used to find theoretical values of temperatures along the length of fin. The Pin Fin Apparatus for Determining Heat Transfer Co-efficient are also used to find the effectiveness and efficiency of the pin-fin for insulated and boundary condition. The cross section of the fin may be circular, rectangular, triangular or parabolic.