A compact, transistorized, incandescent flasher is adjustable from 5-20 flashes/sec. When photographed as it moves across the table with an open shutter camera, a series of white dots appear on the film enabling quantitative analysis. Stroblink "A" may be calibrated by connecting it to an oscilloscope, and switched on and off without disturbing a pre-set flash rate. The flasher unit, which is built into a molded plastic casing, assembled with a 3-volt cadmium battery for Less Weight. This model is the lightest on the market today. It also may be photographed clearly even in a full room light.