This series of meters adopts imported single-chip microcomputer programming, with quick response to test parameters, high precision and strong anti-interference. Pulse signal input, can switch the measurement speed, line speed, frequency through the internal settings of the instrument, with upper limit alarm function, switch power supply 90-250VAC, display range 0-9999. Please confirm with the customer service before ordering the instrument function, or other special requirements, thank you for your cooperation!