I also have the PROTEK B940 bench DMM, but i couldn't recommend it to anyone. The selector switch is hard to turn, the LCD is hard to read and looks like it has the old problem of LCD's with that rubbery contact strip that doesn't, so you get some of the sections lighter than others and its hard to read at angles.
For some reason the backlight is a momentary on, as opposed to a latch. I never understand that one, especially on a mains powered device (though it can be powered by a 9V battery). I like the backlight on, same as the audible beep for continuity tests.
If the device doesn't have the faculties to store a boolean flag between sessions, a simple latched switch solves that.