Today I bought a 50p set of vernier callipers from Tesco
La nostril to nostril width = 23.05mm
Width of Ben's glasses = 129.80mm
Width of La's glasses = 129.80mm
Height of La's ear (right) = 51.50mm
Height of Ben's ear (right) = 55.90mm
Length of La's index finger (right) = 87.55mm
Length of Ben's index finger (right) = 103.05mm
nostril deviance: 9.40mm
glasses deviance: 0.00mm
ear deviance: 4.40mm
index finger deviance: 21.50
mean deviance between La and me: 5.68mm
(For everything else there's a ruler - La)