The Danfoss Nozzle Checking Tool Set is an essential piece of equipment for any professional HVAC technician servicing oil burners. This kit contains five precision-machined master test nozzles designed for the accurate calibration and verification of oil nozzle test stands. By using these reference nozzles, technicians can ensure their testing equipment provides correct readings for flow rate and spray pattern, leading to precise burner adjustments, optimal combustion efficiency, and reliable performance. Each nozzle is housed in a durable, protective plastic case for safe storage and easy identification.