You also need the actual door locks themselves don't you? Or are you planning to use it in a different fashion?
Edit
The DCV calibration has held up over the weekend as these shots taken just now indicate.
I get 1.219V and 667mV, which seems close enough to me.
These things pretty much all have volt-free contact outputs (SPCO relays) so you can implement your own solution. Standard maglocks work at the same voltages as the keypads (12-24V ac/dc nominal), they're easy enough to come by.
Not sure what I want to use it for yet, I mainly wanted one to play with really, pure curiosity.
Thanks for checking those voltages for me and I agree with you, they are close enough. It looks as if the MAX134 is the guilty part after all. Soon find out now hopefully, it wont take long for the new one to arrive.
I've got my eye on some more matching gear to hopefully join it
I've discovered that the 8840A is not the best meter to go poking about inside it checking voltages as the input impedance is so high that if the measure the higher voltage first (in this case, 1.22V), it struggles to read the lower voltage afterwards and takes a long time for the voltage to decay, whereas the Brymen works perfectly