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Wind & Weather IN6809. Home Comfort Monitor with Quartz Clock & Galileo Thermometer. Instructions. Clock Battery Replacement. When replacing an old battery,To read the ambient temperature on a Galileo thermometer is very easy. What you have to do is simply look at the lowest ball that is floating while ignoring 1. Hang your Galileo thermometer inside and from a hook. · 2. Let a few minutes for the spheres that are floating within the thermometer tube to climb and fall