The TMR-02M module was designed as an easy to use device for generating square pulses of fixed amplitude (TTL, +5 V) and variable length.
The TMR-02M has two digital switches to set PULSE duration and DELAY time. It can be used continuously or for a selectable number of cycles. A switch allows manual start (and stop while cycling), but the unit can also be operated using an external TRIGGER. The TRIGGER output can be used to control external devices, e.g. an oscilloscope.

Specification

PULSE SWITCH:
5 digits thumb wheel, 0.01 to 999.99 ms, digital
DELAY SWITCH:
5 digits thumb wheel, 0.01 to 999.99 ms, digital
TIMER OUT:
BNC connector, TTL signal
TRIGGER OUT:
BNC connector, TTL signal, 1 µs
TRIGGER IN:
BNC connector, TTL signal, 10 µs minimum
DIMENSIONS:
12 HP (606 mm) x 3 U (128.5 mm), 7" (175 mm) deep.