The Riester ri-pen is a diagnostic penlight with an LED lamp, for examining pupils and for general use. Its aluminium casing has a metal pocket clip and carries a pupil gauge (2 to 9 mm) and an 8 cm ruler.
It switches on and off at a push button on the end cap and comes with two AAA batteries. The LED gives UV-free light and is validated as a diagnostic lamp for pupils under EN 62471. This one is black.
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