Portable, light in weight, light in pressure. Easy to use. The structure is designed with a pressure fine-tuning handle, and the output pressure can be easily changed by rotating the fine-tuning handle. In addition, a high-pressure hose is connected to the calibrated meter, and the instrument connector is connected to the pressure gauge. Manual operation The pressure pump can be carried to the site and directly connected to the instrument to be calibrated, and the calibration is quick and easy.