The Ametek Digistrobe series are easy to use, multifunction digital instruments that provide both stroboscope and tachometer functionality in one unit. With a flash rate of 20.0 to 29,999 FPM and a tachometer range of 120.0 to 99,999 RPM, these instruments are ideal for most speed measurement applications They have an accuracy of + 0.01% +LSD.