ETS-Lindgren HI-2200 RF Survey Meter - Manual (Page 28)

28 | Operation
About Matched Probes
When a probe is calibrated with the HI-2200 it becomes a matched probe.
Matched probes are indicated by the barcode labels found on the back of the
HI-2200 and on the shaft of the probe. The number below the barcode on the
probe matches a number on the back of the HI-2200.
If a probe has not been calibrated with the HI-2200, NO CALIB will appear on the
display while the probe is connected. If you receive this message, contact
ETS-Lindgren Customer Service.