What are you measuring? girth or OAL
For Girth the measuring blocks are faster and error free, you can't make a mistake
For OAL I use a micrometer a 1-2" covers almost all pistol cartridges (.380 is under 1")
E-Bay has (1,837 results for micrometer 1-2) mostly $20 -$30 but with a few about $10
I do have Vernier calipers but no dial and no plastic. I find the micrometer much easier to use for measurement, but then just set a caliper to that measured length and lock the caliper.
I have several Vernier's as I pick them up at Garage sales for $1
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