VOLTCRAFT VC-337 Operating Instructions Manual page 41

UFC Low-pass filter function is activated
End Low-pass filter function is deactivated
OFF Move to this position to turn the multimeter off
NCV Non-contact AC voltage detection
EF Display symbol in NCV mode
True RMS Actual effective value
HOLD Enable/disable data hold function
ZERO Perform the zeroing with DC measurement (DC-A)
REL Call up the relative value measurement and set the reference value (not possible for DC measurement,
continuity test, diode test and NCV)
SELECT Key for function switching in multiple measuring functions
OL Overload indicator; the measuring range was exceeded
Battery data symbol
Diode test function
Acoustic continuity test
AC Alternating current symbol
DC Direct current symbol
COM Connection for reference potential
V Voltage mode (Volt = unit of electrical voltage)
A Current mode (Ampere = unit of electric current)
Ω Resistance mode (Ohms = unit of electrical resistance)
Measuring function of capacitance measurement
Polarity direction plus pole for DC measurement (DC/A)
Polarity direction negative pole for DC measurement (DC/A)
Symbol for display illumination
41