Does this item come pre-calibrated? Will you be able to provide document on the calibration?

No, it doesn't come with pre-calibration. I just checked it with a calibrated one.

What kind of batteries do these calipers use?

Copy and paste this - 50 357 Alkaline Watch Batteries LR44 AG13 SR44W Battery - for a lot of 50 battery cells that work for this Caliper.

can i use this to measure screws? i mixed up a bunch of screws in a bag and have no idea what size is which.

Yes, however you might benefit by using a thread checker instead. It is difficult to determine thread pitch using calipers. Thread checkers work when you thread a screw into the checker or a nut onto it. This has the advantage of sorting the 8mm screws and nuts from the 5/16" screws and nuts. It also allows you to determine if a screw or nut is a #12 SAE as opposed to a 1/4" SAE screw or nut.

Manufacturer	Neiko
Part number	01409A
Item Weight	658 g
Product Dimensions	43.18 x 15.24 x 0.25 cm; 657.71 g
Batteries	2 Product Specific batteries required. (included)
Item model number	01409A
Size	12"
Color	Silver/Black
Style	12" BLACK
Material	Stainless Steel
Pattern	Caliper
Power source type	Battery Powered
Item Package Quantity	1
Measurement System	inch, fractions, millimeter
Measurement Accuracy	0.001” / 0.02 mm
Display Style	LCD
Included components	12-inch digital caliper, 1 case, 1 extra battery
Batteries Included?	Yes
Batteries Required?	Yes
Battery Cell Type	Alkaline

Neiko 01409A 12” Electronic Digital Caliper | Extra Large Display | 0-12 Inches | Inch/Fractions/Millimeter Conversion | Polished Stainless Steel

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