Extech Instruments EX520A Quick Start Manual page 6

Maximum and Minimum Readings
Press the MAX/MIN button to toggle the maximum and minimum
reading displays. The MAX and MIN display icons show the se-
lected mode. Long press the MAX/MIN button to exit.
Relative (REL) Mode
The Relative feature allows you to make measurements relative to
a stored reference. The displayed value is the difference between
the reference and the measured value.
Press the REL button to store the reference (REL will appear). The
display will now indicate the difference between the stored value
and the measured value. Press REL to exit.
Low Pass Filter (LPF)
Long press the LPF button to engage/disengage the low pass filter
circuit. Use LPF when measuring voltage on variable frequency
drives (VFD).
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