I have used the Adjustable Powder measure with attached funnel, sold by The Gun Works, and now made by TRESO, since it was originally made by Tingle. They work just fine. The marks for the 5 grain increments are far enough apart that it takes NO great effort to adjust it to one or two grain increments. For revolvers and pistols, or very small bore rifles, this is important in developing a load. Its not particularly relevant when working with .45 and larger caliber rifles, and using BLACK POWDER. When people work up a volume load of powder for small bore guns, they generally will make a "fixed" powder measure to go with the gun, and use it exclusively to measure powder charges. You will often see these measures tied to a powder horn, dedicated to that particular rifle, and hunting pouch.
If you use any of the substitutes, it may be even less important to worry about a difference of a few grains. The 5 grain scale is more than adequate.