PeakTech P3340 Bedienungsanleitung Seite 41

8. REL-Δ-button
When the REL-Δ button is pressed the present reading becomes the zero
reading and all subsequent readings are displayed relative to this value.
This function is cleared by pressing the REL-Δ button > 1 sec. which
returns the meter to normal operation.
9. MODE-button
For switching from AC/DC voltage ranges to current ranges and from
resistance, diode test and continuity test.
10. ON/OFF button
For switching the instrument on and off.
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