Sper Scientific 840046 RF Microwave Meter - Manual (Page 13)

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MEASUREMENT PROCEDURES
Zero Offset Adjustment
If the meter shows a measurement
other than 0 due to background EMF,
zero adjusting will eliminate this
electromagnetic interference.
Press ZERO to adjust and obtain a
0 measurement. “ZERO” will appear
on the LCD.
Overload Indicator
When the reading exceeds 4 mW/cm
2 ,
“OL” will appear on the LCD to indicate
overload.
Low Battery Indicator
The symbol will appear on the
LCD to indicate a low battery. Replace
the battery (see page 16).