Amprobe AM-270 Industrial-Multimeter - Manual (Page 12)

6
Normal forward voltage drop (forward biased) for a good silicon diode is
between 0.400V to 0.900V. A reading higher than that indicates a leaky
diode (defective). A zero reading indicates a shorted diode (defective). An OL
indicates an open diode (defective). Reverse the test leads connections (reverse
biased) across the diode. The digital display shows OL if the diode is good. Any
other readings indicate the diode is resistive or shorted (defective).
Temperature Function
Press SELECT button momentarily to toggle between °C and °F readings, and
the new setting will be saved automatically in the non-volatile memory as
power up default.