I remember a while back that somebody was looking for an accurate tire pressure gauge. Came across this advertisement stating .05% accuracy which is pretty dang good. I don't own this tool or know of its quality.
https://miltonindustries.com/produc...KW1qhF-QKQ2r0nuCdT4HLW1GjwuYLmFbGOTlLXyUZ6yKs
https://miltonindustries.com/produc...KW1qhF-QKQ2r0nuCdT4HLW1GjwuYLmFbGOTlLXyUZ6yKs