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The T150 instructions state it has a 'self test'.... greatYes, in the olden days the proving of the tester before/after checks was really critical for that reason, but the reliability of LED indicators has the down-side that folks tend to assume they never break, which is a really bad thing to do!
I see the TIS one claims to be "self proving" or something, I am quite sceptical of that. Sure you can check the LEDs like and continuity is showing it, and that is a damn sight better than nothing, but I would be very weary of trusting that self-check options are really verifying the live path is correct to the point I would trust my life (or others) on that alone.
It tells you what to do on the instrument, all the lights flash showing you it's working, it then ends the 'self test' instructions by saying 'and then test on a known voltage, such as a socket'!