For a manual powder measure used as described (with single-stage reloading), I relied for years on an Ohaus Du-O-Measure that someone gave me. Then the powder hopper broke, with no way to replace it, since the Ohaus reloading side went to RCBS a long time ago, and the measure wasn't continued in production. I bought a RCBS measure (pictured in a previous post) on eBay used for around $35, and am very pleased with it. Even with stick powders, accurate ± .2 grain.
As a previous poster noted, what I actually use now for my rifle (single-stage) reloading is an RCBS electronic scale / measure separate combo that communcate via an infrared port. This equipment was made by PACT, and RCBS has superseded this unit with a different all-in-one model, I don't know who makes it. I get completely accurate powder measurement automatically......so there's seldom any reason to take the manual measure off the shelf.