The Magnehelic water column gauge. Does it need to be level?

I check operation of the gauge when it is level and when it is out of level to see if the gauge is inaccurate when out of level.
This is a response to smartestmanonnet.
This video is part of the heating and cooling series of training videos made to accompany my websites: www.graycoolingman.com and www.grayfurnaceman.com to pass on what I have learned in many years of service and repair.
If you have suggestions or comments they are welcome.
If you are a homeowner looking to repair your own appliance understand that the voltages can be lethal the fuels are highly flammable and high pressures are used.
Know your limits.

Источник: rutube.ru