Practical Instrument Electronics 850 - Manual (Page 26)

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Simulate pH probes into transmitters & analyzers
Use the pH simulator to verify proper operation of pH devices
before you place a probe into a calibrated buffer. Adjusting the
pH transmitter or analyzer without a probe allows you to make
sure the device is calibrated and operating correctly. The 850
simulates 0.000 to 14.000 pH @ 25°C corresponding to 414.12
to -414.12 mV.
Once the pH instrument has been adjusted against the PIE 850
reconnect the pH probe and check it against the proper buffer
(typically 7 pH). If the instrument zero point requires more than
the manufacturer’s recommendations (typically within 0.5 pH) it
is time to clean or replace the probe.