Safe-T 46110 mmArc Protractor Compass Plus – Pack of 1 – Made of Clear Plastic with Bluish Hue, 15.8 cm long, Semicircular side with rotating disc inset on one edge, Spinning & Accurate Protractor revolves easily within a groove, Creates Circles from 10mm radius to 120mm radius on 1mm radius increments, Allows direct view of vertex points, Straight Edge sides have inch/metric scales, Works well with Vis-a-Vis or other felt tip pens, Can be used with Rightstart Mathematics, Safe for Children
Safe-T 46110 mmArc Protractor Compass Plus – Pack of 1 – 15.8 cm long, Made of Clear Plastic with Bluish Hue, Semicircular side with rotating disc inset on one edge, Spinning and Accurate Protractor revolves easily within a groove, Creates Circles from 10mm radius to 120mm radius on 1mm radius increments, Allows direct view of vertex points, Straight Edge sides have inch/metric scales, Works well with Vis-a-Vis or other felt tip pens, Can be used with Rightstart Mathematics, Flat enough to use as a bookmark in a high school geometry or algebra text, Safe for Children, Dimensions 6.22 x 3.06 in x 0.06 in – The disc has holes at distances of 10 to 19 mm from its center. The rectangular part of the instrument has ten rows of ten holes, at distances of 22 to 120 mm from the center of the disc. To draw circles, one fixes the disc at the center, places a pencil or other writing implement at the desired radius, and rotates either the disc or the rectangle. The semicircular edge is divided to degrees and marked by 20s from zero to 180 in the clockwise direction and by 20s from 10 to 170 in the counterclockwise direction. The disc is marked: SAFE-T PROTRACTOR. It directs students to look at the upper, black numbers for angles facing left and at the lower, red numbers for angles facing right. A scale of 11 centimeters, divided to millimeters, is along one edge, and a scale of four inches, divided to 16ths of an inch, is along the other edge.
Product Features
- Safe-T 46110 mmArc Protractor Compass Plus, 15.8 cm long, Made of Clear Plastic with Bluish Hue, Semicircular side with rotating disc inset on one edge, Spinning and Accurate Protractor revolves easily within a groove, Creates Circles from 10mm radius to 120mm radius on 1mm radius increments, Allows direct view of vertex points
- Straight Edge sides have inch/metric scales, Works well with Vis-a-Vis or other felt tip pens, Can be used with Rightstart Mathematics, Flat enough to use as a bookmark in a high school geometry or algebra text, Safe for Children, Dimensions 6.22 x 3.06 in x 0.06 in
- The disc has holes at distances of 10 to 19 mm from its center. The rectangular part of the instrument has ten rows of ten holes, at distances of 22 to 120 mm from the center of the disc. To draw circles, one fixes the disc at the center, places a pencil or other writing implement at the desired radius, and rotates either the disc or the rectangle
- The semicircular edge is divided to degrees and marked by 20s from zero to 180 in the clockwise direction and by 20s from 10 to 170 in the counterclockwise direction. The disc is marked: SAFE-T PROTRACTOR. It directs students to look at the upper, black numbers for angles facing left and at the lower, red numbers for angles facing right
- A scale of 11 centimeters, divided to millimeters, is along one edge, and a scale of four inches, divided to 16ths of an inch, is along the other edge.
Please let me know if my review was helpful! I love having this at my disposal when doing engineering homework. Makes some very neat circles. If you want even more options on size, instead of use the specified center, you can pick any hole and put a pin there, to use as the new center. Only problem that I found was that when making the smaller circles inside the rotating structure, it’s fairly difícil and involves a great amount of force, which can reduce the quality of circles drawn. Other than that, pretty sweet tool to have.
Easy Circles Easy to use, and a great tool for any designer or artist.
Ingenious design… Draw up to about 9.5″ circles… device is in metric… I was able to get good circles each time… the little wheel that you hold stationary has enough play in it to cause inaccuracies… can’t be helped.For the price, I wanted better build quality… the plastic seems thick enough, but the inner circle has play in it, and there’s a ‘bump’ when operating, enough to create a little mark in the circle… overall, I’m please, and with free shipping it become a great deal.