YTXC-100-Z, YTXC-150-Z seismic, pressure gauges contact with anti-Pulse and medium impact load, vibration-resistant environment, such as outstanding characteristics of the application of measurement of copper and copper alloy non-corrosive gas, liquid or vapor pressure, and so on. Instruments based on the lower limit of two switch-contact device, the pressure to set a signal or when the value of on-off control circuit for the operating system's automatic control or the use. Its anti-vibration structure can be effectively checked pointer jitter, the impact, the protection of contact so that the instrument instructions clear, credible signal switch, work stability. Widely used in machinery, chemicals, petroleum, metallurgy, electric power and other industrial processes.