Homemade Sausage Making

I am attempting to upload an RH chart. This chart is useful for determining relative humidity in a curing room. All you need are two thermometers, a simple cotton wick and a water source (a pan or a jar). One thermometer for the dry bulb reading and the other with its bulb in a simple cotton wick, one end of which sets in the water, for the wet bulb reading.

to get an accurate wet bulb reading you need a sling cycometer and enough room to swing it. just putting out a thermometer with a wet bulb won't give you a proper reading.

How accurate do we have to get? This system has worked well for me for a long time.