The Monarch PLS Pocket LED Stroboscope is a compact, rugged, light weight device that provides a super bright, uniform light output for performing visual diagnostic inspection and RPM measurements. The silent cool running LED's are extremely energy efficient providing up to 5 hours of operation on a single charge. A wide operating range of 30-300,000 flashes per minute covers most industrial applications. Additional features include external input for remote triggering or tachometer mode, pulse output, memory for up to 5 preset flash rates, N.I.S.T. calibration certificate, tachometer mode for speed measurements up to 250,000 rpm using optional remote sensors and TTL pulse output.