Don't you need to find a true level item to calibrate this level?

It is possible to level a "level" by flipping it 180 degrees (end-for-end) and setting it up to read exactly the same number of divisions off of ideal. Alternately, one can set up a local "true level" by shimming a surface until it reads the same with the level flipped 180 degrees... In any case "level" can be established as derived standard.

Is this a 0005" per 10" master level?

No that is a 4 inch 98 level good to .005 if an inch.

how do you calibrate this

Find a pretty level surface set 98 on mark with sharpee the edges.. on one end of level are hex nuts above and below that is your ajustment point with level on surface and marked with sharpee look at bubble now turn level 180 degree make sure to put the level back into the marked area look at bubble now a just ..

are the screw and stud supposed to be centered on the post? The one I received had the holes off center.

The upper part is an unmachined casting, but I am sure that Starret makes sure that the holes are drilled centered to the prizm below. It is not relevent that the hole is not centered in the post. Just my two cents.

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⚙️ Level Up Your Craft with Starrett Precision!

COMPACT YET POWERFUL - 4-inch length fits perfectly in your toolkit without compromising on precision or reliability.
ENGINEERED FOR RUGGED USE - Cast iron base with satin brass vial housing delivers unmatched durability in any machine shop.
PRECISION IN EVERY BUBBLE - Adjustable ground glass vial ensures ultra-accurate leveling with 4-4.5 minute sensitivity.
PERFECT FIT FOR ROUND WORK - Involute groove base guarantees stable seating on pipes, shafts, and conduits for flawless results.
TRUSTED HERITAGE MADE IN USA - Over 140 years of Starrett innovation means you’re wielding a tool built for excellence.

The Starrett 98-4 Machinists' Level is a 4-inch precision tool featuring an adjustable ground glass vial with 4-4.5 minute sensitivity, housed in a durable brass tube and mounted on a cast iron base with a unique involute groove for stable seating on round objects. Designed for machine shops and tool rooms, this USA-made level combines heritage craftsmanship with rugged durability to deliver unmatched accuracy for professional use.

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€ 306.66

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Slovakiastore

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Brand	Starrett
Material	Brass, Cast Iron
Color	Clear
Style	Without Case
Item Weight	0.4 Pounds
Operation Mode	Manual
UPC	049659504408 049659623451
Global Trade Identification Number	00049659504408
Manufacturer	Starrett
Part Number	98-4
Item Weight	6.4 ounces
Product Dimensions	1 x 1.2 x 4.5 inches
Item model number	98-4
Is Discontinued By Manufacturer	No
Size	4"
Thickness	1 Inches
Power Source	hand_powered
Item Package Quantity	1
Included Components	Unit^Instruction Guide
Batteries Included?	No
Batteries Required?	No
Warranty Description	One Year on defects in material and workmanship

Starrett Machinists' Level with Ground and Graduated Main Vial - Ideal for Machine Shop and Tool Room Use - 4" Length, Without Case and Cross Test Vial - 98-4

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