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Fowler 54-422-450-1 Mini-MAG Protractor, 360° Maximum Measurement, 0.05° Repeatability

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Specifications for this item
Number of Items
Overall Width
1.375  inches
360 degrees
Part Number
0.05 degrees
Brand Name
Size Name
360° Measuring Range, 0.05° Repeatability
Measurement Accuracy
+/- 0.2 degrees
Maximum Measurement
360 degrees
Overall Length
2.375  inches

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Key Features

  • Electronic protractor with 360 digital display of any angle
  • Measuring range of 360 (4 x 90)
  • Embedded magnets with 5 lb. pull, on sides and bottom
  • Display inverts for reading ease
  • Hold feature freezes the displayed reading

Package Details

Shipping Weight: 0.55 pounds
Package Size: 3.6 x 3.3 x 1.8 inches

Product Description

The Fowler Mini-MAG Protractor 54-422-450-1 is an electronic protractor with 360° digital display of any angle and embedded magnets on the sides and bottom with 5 lb. pull. The display inverts for reading ease. The protractor has a measuring range of 360° (4 x 90°) and a hold feature that freezes the displayed reading while retaining the original zero reference information. The protractor can also be set to read absolute zero, for use as a leveling device. It has a resolution of .05° and an accuracy of + or - .2°.


Measuring range360° (4 x 90°)
Accuracy+ or - .2°
Power source9V battery
Dimensions2.375 x 2.375 x 1.375 inches (H x W x D)

H is height, the vertical distance from lowest to highest point; W is width, the horizontal distance from left to right; D is depth, the horizontal distance from front to back.

Protractors are tools that measure specific angles, which allow users to create and replicate desired angles. The tools include a stationary base and movable rule, usually connected by a scale that may be digital or manual. They are useful in a wide range of applications, such as measuring crown molding and installing baseboards. A protractor can be included as part of a combination set, along with a center and a square. A center accurately locates the center of a circle or cylindrical rod. A square is used to scribe right angles and parallel lines, calibrate miter and table saws, or as a miter, height gauge, or depth gauge.

The Fred V. Fowler Company manufactures inspection and measurement instruments such as electronic indicators, calipers, bore gages, and digital scales. The company, founded in 1946, is headquartered in Newton, MA.

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