The objectives of project are to study the changes of pressure and comparison of the pressure of the equipment of measuring tools. To use as a learning instruments and measurement equipment in the industry. The students know methods quantify mechanical. The experimental device is cylinder hydraulic diameter of 20 mm. Stroke 50 mm. And pressure can be adjusted to the pressure exerted on the diaphragm. smooth with a thickness of 3 mm. diameter 15 mm. Test methods lead weight scales to put the arm supporting the weight attached to the cylinder to compress hydraulic oil to the pressure cooker to make the disc diaphragm rapid expansion.