The price is reasonable, but it real use will be for leafshutters.
For a light source you will need a non flickering one, like a light bulb not those energy saving things.

Years ago I build my own in a 19" rack.
Basics: power supply, 5 point measuring head, 5 op-amps, AND gates, cristal oscillator and 3 3 1/2 digit counter and display's.
It measures 3 points at the same time with a choice between horizontal and vertical for focal plane shutters and a single measuring point for leaf shutters.
Works great !
Cost: a bit more than this one, but what the hell....

Peter