A moisture meter has saved me a bunch of times.
I know anything I put in my drying box will check if it is above 16% MC, no mater how well it is shellacked. My meter tells me when it is safe to speed up the drying process.
Bunches of folk have stopped by my shop with wood they said was cut a long time ago, was very dry and ready to make bows from. My moisture meter proved them wrong.
Bottom line, if you make a lot of bows, cut a your own wood or even buy wood that is supposed to be seasoned, a moisture meter is invaluable.
I don't use the conversion chart for different species with my meter. All I have to know is when it reads 12% my osage is good to go.
I have had this pinless model for the last 15 years, well worth the 200+ bucks I paid for it.