There is one, not so obvious, thing to watch out for on DVMs, VTVMs, and VOMs. Some are reversed on resistance or diode checks. All of my Flukes have been correct, or should I say intuitive, with - on the black lead for diode checks. My Sabtronics DVM at home has - on the red lead on all resistance scales. I need to keep that in mind because I often use it to check LEDs on the 100 ohm X10 scale. I try not to reverse bias LEDs because they typically have a very low reverse breakdown voltage.
Joe
