Practical Instrument Electronics 850 - Manual (Page 4)

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General Information
The PIE Model 850 is more than a multifunction
calibrator. It is also a loop detective that is able to
diagnose common problems that other test
equipment just can’t find. Have a flooded junction
box or unknown ground faults? Our Loop Diagnostic
technology will detect it. Or use the LoopScope to
see at a glance all the parameters - milliamps,
voltage and resistance - in the loop. Diagnostic
features are covered by US Patent #7,248,058.
Become a troubleshooting technician with
Patented Diagnostic Technology - Available only
with PIE Calibrators!