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I use this when checking that my RV is level in the freezer part of my absorption fridge.
Gen-turi, put it on your generator exhaust and it funnels the CO to top of your RV. Good for tailgating, etc.
If you are using a external generator and an EMS, if will complain about floating ground, you can use this to get that error to go away.
Too much sway/shaking while moving around in the RV at the campground, give these a consider, permanently mounted.
If you think you have a propane leak, turn off propane and use this to see if it “sniffs” any propane.