Where is the size 12? this product appears to skip 12 and go from size 10 to 1/4?

#12 is not 1/4"---imperial machine screw sizes are in 64th's--- Therefore, #12 = 12/64 = 6/32 = 3/16---NOT 1/4

I thought it supposed to have thread in it

This is a thread gauge. The thread gauge is on the back side of the gauge. One of the listing pictures clearly shows this.

How does this tool define internal thread pitch (e.g. nuts)?

This gauge doesn't measure "internal" threads, only external threads. It can find the size of a nut but not the thread pitch of a nut. However, if you know the size of the nut then it's pretty easy to determine the thread pitch. There's only two thread options per size so just look at the threads and you can see if it's the coarse thread or fine thread. For instance, if the gauge determines that the nut is 1/2" then your two thread options are 13 or 20. The gauge shows you that part. If the threads look fine then you have a 20 thread if it looks coarse then you have a 13 thread. Hope this helps.

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🛠️ Nail every measurement with MarineBoltSupply precision!

MARINE GRADE DURABILITY - Crafted from tough green plastic, built to withstand demanding environments.
UNIVERSAL THREAD MASTERY - Seamlessly measure both standard and metric bolts, nuts, and screws with unmatched accuracy.
CLEAR EASY TO READ MARKINGS - Quickly identify measurements without guesswork, boosting your workflow efficiency.
COMPACT LIGHTWEIGHT DESIGN - Take precision on-the-go with a sleek, portable tool weighing just 59 grams.
COARSE FINE THREAD VERSATILITY - Effortlessly gauge all thread pitches, ensuring perfect fits every time.

The Marine Bolt Supply Nut, Bolt & Screw Gauge is a compact, lightweight measuring tool designed for professionals who demand precision. Featuring both standard and metric scales, it accurately measures coarse and fine thread diameters, lengths, and pitches. Constructed from durable green plastic, this gauge is perfect for marine and industrial applications, ensuring reliable performance in any setting.

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Manufacturer	Marine Bolt Supply
Part number	1-NBG
Item Weight	59 g
Product Dimensions	22.23 x 8.26 x 0.64 cm; 59 g
Item model number	1-NBG
Color	Green
Material	Plastic
Item Package Quantity	1
Number Of Pieces	1
Head Style	Hex
Measurement System	Metric
Batteries Included?	No
Batteries Required?	No

Marine Bolt Supply Nut, Bolt & Screw Gauge (Standard & Metric) (Coarse & Fine) Diameter, Length & Thread Pitch (Green)

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