View the thread, titled "Need help concerning Vacuum Gauge Calibration" which is posted in Commercial Electrical Advice on Electricians Forums.

You said the gauge fitted to the furnace was showing -1 maybe this gauges calibration should be checked as it did not agree with the PLC/transducer.

Depending on the increments on this gauge of course, if divided into 200mb sections that wouldn't be accurate enough to tell.
 

Reply to the thread, titled "Need help concerning Vacuum Gauge Calibration" which is posted in Commercial Electrical Advice on Electricians Forums.

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