Sx48-z, sx72-z, sx96-z series tachometers is suit for count of electromotor, generators, and so on industrial or agricultural appliance or motor tester, examination equipments for high precision rev measure. \r\n\r\nits maximum measure count range is 65536rpm. it strong resist electromagnetic radiation with big size and high light led. it can setting count down or up with the alarm output. \r\n\r\nthis tachometer is adapted to all kinds of sensor input such as: photoelectricity sensor, hall sensor, magneto-dependent sensor etc. \r\n\r\nit can be setting the alarm function of upper limit or lower limit.