Accurate angled feeler gauges?

[donkmeister]

Is there a reputable brand that makes angled feeler gauges, or has anyone bought a set they verified to be accurate at least to within a few percent that they would recommend? My go-to brand for any sort of fine measuring equipment is Mitutoyo, but they only do straight feeler gauges.

I was shocked but not surprised to find that the no-brand set I'd recently bought from Amazon were massively out (errors were 10-25%, some plus some minus) when measured with a Mitutoyo micrometer.

I realise I could buy a set, check them then send them back if they're crap but I'd rather just buy once if possible!