DC Linear Integrator Transducers
The M100-DI2 is the same as
M100-DI1 with the additional feature of having 2 relay outputs,
this allows the user to feed one set of pulses to a counter on
a switchboard whilst feeding the other set of pulses to a remote
computer in a control room.

M100-DI1    Single Relay Output 
M100-DI2    Double Relay Output