My quote is from the All Comms diagnostics calibration procedure - I think the full-on Land Rover calibration does the same....

How the Snap-On stuff works and how it calibrates I don't know....sorry!
 
GR is right other than the height settings for the sensors there’s is a calibration setting. sometimes people use it to try and higher the overall height as this effects all levels.

The pressure relief valve should kick in before they blow so somethings been tampered with I reckon
There is not a safety valve on the air bags which I think should be illegal
 

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