Does it come with a calibration certificate?

Nope. But regardless it is a lovely rule.

can this be used as a precision straight edge ? (for cylinder head warpage measurement )

Yes it’s rigid and machines flat and straight

Are the graduations "troughs" that you can use to precisely guide a center punch off the edge?

Disclaimer regarding my previous answer. Just noticed the picture on description page. If the pictures are accurate, first graduation doesn't seem to be correct from the end, and, its not made in Japan, now. My previous answer may not describe the USA 182-125 model.

Are the graduations etched?

Yep. It's quite nice and very legible.

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182-125, Steel Rule, 12"/300mm (1/32, 1/64", 1mm, 0.5mm), 3/64" Thick X 1" Wide, Satin Chrome Finish Tempered Stainless Steel

182-125, Steel Rule, 12"/300mm (1/32, 1/64", 1mm, 0.5mm), 3/64" Thick X 1" Wide, Satin Chrome Finish Tempered Stainless Steel

Product ID: 290380014

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✨Satin chrome anti-glare finish

📏12"/300mm precision length

🔩Tempered stainless steel durability

Description

📏 Measure Like a Pro, Own the Precision!

BUILT TO LAST - Tempered stainless steel construction ensures long-lasting strength and resistance to wear.
SLEEK FUNCTIONAL - Satin chrome finish reduces glare and enhances readability in any lighting condition.
OPTIMAL THICKNESS WIDTH - 3/64" thick and 1" wide for a sturdy, easy-to-handle measuring tool that won’t flex under pressure.
AUTHENTIC QUALITY ASSURANCE - Directly sourced from Mitutoyo UK, guaranteeing genuine Japanese craftsmanship and unmatched accuracy.
PRECISION AT YOUR FINGERTIPS - Dual graduations in imperial (1/32, 1/64") and metric (1mm, 0.5mm) for versatile, exact measurements.

The Mitutoyo 182-125 Steel Rule is a premium 12"/300mm measuring tool crafted from tempered stainless steel with a satin chrome finish. Featuring dual imperial and metric graduations for versatile precision, it combines durability with anti-glare readability. Perfect for professionals demanding accuracy and reliability, this authentic Mitutoyo product ensures long-term performance and confidence in every measurement.

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