Manometer recommendation

Hi all -

I have a Lennox high efficiency furnace in my house that I'd like to do basic diagnostic work on should a warning code come up. The pressure switch is rated at 0.9"WC. It looks like my go-to place for buying things (amazon) only sells manometers that can measure +/-0.6"WC. Does anyone have a recommendation for a manometer that can measure this?

I am really only interesting in verifying there is no obstruction / the inducer motor is operating well and generating enough of a vacuum to trigger the pressure switch.

Thanks!

submitted by /u/LunaticEngineer
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