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Groz 01304 4-Inch Pocket Brass Caliper, Inside & Outside Measurements, Non-Magnetic, Dual Imperial/Metric Graduations for Mechanics, Hobbyists, EDC

  • Based on 249 reviews
Condition: grozusa.com
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Features

  • POCKET-SIZED PRECISION - Slip this compact 4-inch brass caliper into your pocket, toolbox, or EDC kit; always have accurate measurements ready when you need to check screw sizes, tubing diameters, or part dimensions
  • MEASURE INSIDE AND OUTSIDE - Both internal and external jaws in one tool; external measurements from 0-4 inches (0-100mm), internal measurements from 7/32" to 4 inches (5-100mm) for complete versatility
  • NON-MAGNETIC SOLID BRASS - Won't interfere with sensitive electronics or magnetized parts; classic brass construction looks great, resists corrosion, and polishes beautifully with regular brass cleaner
  • DUAL IMPERIAL AND METRIC SCALES - Read measurements in inches (1/16" resolution) or millimeters (0.1mm resolution) without math conversions; close-tolerance dovetail design ensures smooth, accurate sliding action
  • AFFORDABLE PRECISION FOR EVERYDAY USE - Accurate enough for hobby projects, DIY repairs, and general shop work at a fraction of the cost of digital calipers; perfect for mechanics, makers, and crafters

Description

Need quick measurements at the hardware store, workbench, or in the field? The Groz 4-Inch Pocket Brass Caliper gives you reliable precision in a compact package that actually fits in your pocket. Unlike bulky digital calipers, this classic brass tool is always ready—no batteries needed, no fragile electronics to protect.This caliper measures both inside and outside dimensions with a single tool. External jaws handle 0-4 inch measurements while the internal jaws reach from 7/32 inch to 4 inches. Dual graduated scales show imperial (1/16" increments) and metric (0.1mm increments) simultaneously, so you can read either system at a glance.The solid brass construction is completely non- magnetic—important when working around sensitive electronics or magnetized components. The close-tolerance dovetail design provides smooth, wobble-free operation. Plus, brass develops a beautiful patina over time and polishes easily when you want that classic shine.Perfect for mechanics, woodworkers, hobbyists, machinists, and anyone who appreciates having a quality measuring tool ready when inspiration strikes.

Brand: Groz


Material: Metal


Product Dimensions: 5.2"L x 1.65"W


Range: ['0 inches', '4 inches', '0 mm', '100 mm'] inches, millimeters


Measurement Accuracy: +/- 0.02 millimeters


Brand: ‎Groz


Material: ‎Metal


Product Dimensions: ‎5.2"L x 1.65"W


Range: ‎['0 inches', '4 inches', '0 mm', '100 mm'] inches, millimeters


Measurement Accuracy: ‎+/- 0.02 millimeters


UPC: ‎816139014135


Manufacturer: ‎Groz


Global Trade Identification Number: ‎35, 46


Item Weight: ‎2.08 ounces


Item model number: ‎1304


Date First Available: ‎March 21, 2016


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: within 30 days

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Top Amazon Reviews


  • Pocket caliper
Very nice. It would be nicer if the lines were etched deeper making it easier to read.
Reviewed in the United States on August 19, 2025 by jenny b good

  • cheap and cheerful
sometimes i need a small measuring tool cause i don't have enough gray hairs in my beard to tell you how thick something is from ten feet away. this little guy will let those of us with degraded or degrading vision more easily tell how thick or thin a particular object with roughly parallel sides might be. it works well for that and the markings seem to line up with my more expensive mitutoyo scales so i trust it well enough for non-critical measurements ... show more
Reviewed in the United States on February 26, 2025 by Just Garbag

  • Decent caliper for the money
This caliper is decent. Not great, but not bad. Made in India... at least its not made in China. Made from real brass. Polishes nice with Brasso, though it was finished nicely as it came. It's reasonably accurate. I wouldn't use it for delicate or highly accurate work, but its good enough for some around the house type stuff, like "I wonder what the diameter of this pen is?" or "I wonder how thick the blade is on this pocket knife?". The machining on it is mediocre. It also doesn't move very smoothly, even after a polish with Brasso. But, it was cheap, and looks pretty (if you like the color of brass), and is accurate enough for hobby type stuff, so I don't regret this purchase. Just don't expect a finely made, highly accurate Mitutoyo or Starrett. ... show more
Reviewed in the United States on October 2, 2023 by Mike H

  • great for animal tracking
I was looking for a small caliper that would be durable and not interfere with a compass (like a steel one would). I don't know about the exact precision as mentioned in other reviews, but its close enough, can measure to 8 inches, and is handy for all sorts of animal tracking and nature observations. its a straight edge for sketches, and it doesn't reflect light in photographs like steel ones. I bought another for a gift for a friend. ... show more
Reviewed in the United States on January 13, 2026 by Amazon Customer

  • Small but handy
Needed a little polishing to get it to slide freely. I trust it to about 1/16 inch. Anyway, all brass looks cool.
Reviewed in the United States on November 6, 2023 by Thomas R Pusateri

  • Perfect size
Bought to carry and measure small items in hardware, works well in a small package.
Reviewed in the United States on December 4, 2024 by christopher tempsick

  • Handy, swipe ink to make it more readable
I bought this to carry in my pocket. It's a little sharp, but in its case it's fine; I may fabricate a leather or 3D printed case for it to make it easier on the leg. The brass is nice, tho the engravings are kind of hard to read, but I just scribbled on it with a ballpoint pen and then smudged the ink into the hash marks, numbers, and other engravings, and it really pops now. You can see the 100mm and the numbers around the slider pin where I didn't get the ink in as good. Handy little tool. 1mm / 1/16" resolution. ... show more
Reviewed in the United States on January 9, 2025 by Timothy Bessler Timothy Bessler

  • Delivery is quick, product is what was described
Nice tool accurate love it
Reviewed in the United States on September 7, 2025 by six-pop

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