STROBOSCOPE The ESL-200A is a super bright, hand held, fully featured LED stroboscope in a compact design. The ESL-200A LED stroboscope is designed to measure the speed of rotating or cycling linear motion objects without contact or reflective tape, as well as freeze motion visually. Lifetime LED lights using pulse width modulation, encased in an aluminum housing, and powered by a NiMH rechargeable battery, make this pocket strobe extremely durable and capable of high flash rates. The ESL-200 is an ideal inspection strobe for for speed, motion and vibration analysis, such as rotating shafts, fans, cams, etc.  Adjustable Flash Duration For most applications standard flash duration works without adjustment. For ultra high speed applications, objects may move during the brief period of a single flash, resulting in a blurred image. The ESL-200 features adjustable flash duration, allowing you to decrease the flash duration, so objects have less time to move and provides a sharper image. Features: High efficiency LED solid-state light source Extended battery life of 10 hours continuous use at 6,000 fpm/rpm Pulse Width Modulation for sharp images at high speed Highly stable drift free operation Auto wide measuring range – up to 150,000 fpm/rpm (over 100,000 display flashes) Push button operation with x2 and ÷2 buttons for easy and precise adjustment 359° Digital phase shift adjustment by 1° increments Rugged aluminum housing – compact size – weighs only 1.2 lb (540 g) Easy-to-read 5 digit 0.47" (12 mm) high LCD Store up to 19 flash rates in memory for records or quick retests (Restarts at the last flash rate) External trigger input and output Tripod mountable Kit includes stroboscope, AC Adapter/charger, and carrying case.