This pocket LED stroboscope is a compact, rugged, lightweight device that provides a super bright, uniform light output for performing visual diagnostic inspection and rpm measurements. The silent cool running LEDs are extremely energy efficient, providing up to five hours of operation on a single charge. Additional features include external input for remote triggering or tachometer mode, pulse output, memory for up to five preset flash rates, and tachometer mode for speed measurements up to 250,000 rpm using optional remote sensors and TTL pulse output.