Speed CheckR for Physics and Science testing.  Readings in meters/second with the option to toggle from immediate readings to delayed readings.  Unique mounting method enables very fast set-up and quick change-over for experimentation.  One simple-to-use device can be used for validation studies of gravity, acceleration, friction, momentum, and velocity measuring of: horizontal, vertical, rotational, and incline movements of objects.  Toggle switch enables device to ignore subsequent beam interruptions or to take immediate/repeated readings. Accuracy of readings:  .01 m/s from .5 to 10 m/s, .1 m/s from 10 to 50 m/s, and 1 m/s from 50 to 100 m/s.  Objects must be .125" width minimum.