Accurate Tape Measure?

[JAZZCNC]

How would you accurately measure 1800mm, Jazz?

Me personaly I would use my Rabone Chesterman No64R 1.5m rule and a 3.2.1 block as accurate marker then go again. Or. . . has john said use 2 rules, probably a 310mm engineers rule in this case.? I do have 1 mtr rule but don't class it has accurate enough to be called precision.! Still leaps ahead of a tape thou.

To give some idea of the quality and accurecy of a precision rule stamped on the Rabone is the warning "Only standard at 20c" and originally came with a certificate of calibration. I've had it for many many years and one of the nice things about living close to Sheffield is you drop across some high quality tools.
( If that border jumping gringo Bandit John S don't snaffel em first.!!!)