How do photographers “freeze motion” to capture the perfect action photo? Explore the mystery of “freezing time” with this affordable and portable stroboscope. Investigate how rotating objects appear to stop moving or switch directions under a flashing light. Bright digital display shows the flash rate so students can collect quantitative measurements to calculate the speed of rotating, oscillating and vibrating objects. Adjustable flash rate of 1–255 flashes per second. Four AA batteries are required and available separately. 2½" x 5" x 1".