Murata Electronics North America has introduced the MHR03xx series of high voltage resistors that are available with tighter tolerances than previous versions. Tolerance is +/-0.5% up to 100MΩ, and 1% above that. Here'w what I like about their data sheet, found at http://www.murata.com/products/catalog/pdf/k99/k99e_l0055.pdf
The provide voltage rating in air, which they call "single use" and also when encapsulated. I like this spec a lot.
What I don't like, is that many specs are omitted. Like temperature coefficient and voltage coefficient. Perhaps they are shown in some other place on their website?
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