Bernie,
I have a T922 and a T935, both working; nice little basic scopes. I checked my parts mule T460 using a FLUKE Meter and a 4 wire test. The resistances are very low. 3-6 = .033 Ohms 4-5 = 1.096 Ohms, in circuit. The scope i am testing has a known good T460. I am thinking that the ringing test that Leo is suggesting would be a more positive test. I have never done such a test, but this will be a good way to learn about the process for me.
Hope this helps.
--
Michael Lynch
Dardanelle, AR
Michael W. Lynch