This HTC Digital stroboscope has multiple applications for measuring cyclic speed to view vocal cords in conditions of hoarseness, can be seen as many gramophone turntables to lightning effect at discotheques. This instrument discharges a series of brief, intense flashing lights at specific intervals and helps its user in many ways. Comes with ranges: H, M, L (High, Medium, Low). Flash Adjust : Coarse adjustment as well as fine adjustment. X2 and ÷2 for fast Check. Triggering mode: Interior/Exterior. Instruction manual, spare flash tube are being provided along with the stroboscope. Used to set the ignition timing of internal combustion engines. Plays an essential role in the study of stresses on machinery in motion, and in many other forms of research. Bright stroboscopes, like this are able to overpower ambient lighting and make stop-motion effects apparent without the need for dark ambient operating conditions. HTC DT-2229 Digital Stroboscope is good for examining or stopping motions for diagnostic inspection purpose.