digital verniers, I'd have to check how far out
I believe the question was intended to reflect that “vernier” is not something that can be digital, as it is a system of indicating by using differentially spaced lines. https://en.m.wikipedia.org/wiki/Vernier_scale
Some people seem to refer to caliper as a vernier, I suppose because early calipers used vernier scales. Thus they refer to a digital vernier when the intended term is likely digital caliper.
I have a pair of vernier calipers and I like that they don’t run out of batteries, though dial calipers have that same advantage while also being quick to read. Micrometers often use a vernier scale to indicate the final decimal place (0.0001” increments for imperial tools). So just saying “a vernier” can be confusing.