--- product_id: 27355485 title: "Compass Pro Speed Bow with Beam Bar 6\" Model 205V Compass for Geometry and Engineering, Included Beam Bar Allows for Drawing Large Circles, Drawing and Architecture Tool - 6 inch" brand: "alvin" price: "S$60" currency: SGD in_stock: true reviews_count: 6 url: https://www.desertcart.sg/products/27355485-compass-pro-speed-bow-with-beam-bar-6-model-205v store_origin: SG region: Singapore --- # 6" Precision Zinc Alloy Build Includes Beam Bar Compass Pro Speed Bow with Beam Bar 6" Model 205V Compass for Geometry and Engineering, Included Beam Bar Allows for Drawing Large Circles, Drawing and Architecture Tool - 6 inch **Brand:** alvin **Price:** S$60 **Availability:** āœ… In Stock ## Summary > šŸŽÆ Master Your Geometry Game! ## Quick Answers - **What is this?** Compass Pro Speed Bow with Beam Bar 6" Model 205V Compass for Geometry and Engineering, Included Beam Bar Allows for Drawing Large Circles, Drawing and Architecture Tool - 6 inch by alvin - **How much does it cost?** S$60 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.sg](https://www.desertcart.sg/products/27355485-compass-pro-speed-bow-with-beam-bar-6-model-205v) ## Best For - alvin enthusiasts ## Why This Product - Trusted alvin brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - ā€¢ **Versatile Design:** Perfect for geometry, architecture, and engineering projects. - ā€¢ **Portable & Organized:** Comes in a hard, see-through case for easy transport and storage. - ā€¢ **Precision Engineering:** Crafted from premium zinc alloy for unmatched durability. - ā€¢ **Large Circle Capability:** Draw circles up to 18" with included beam bar and pen adapter. - ā€¢ **User-Friendly Mechanism:** Quick adjustments with a sturdy push button for seamless use. ## Overview The ALVIN Compass Pro Speed Bow is a high-quality geometry and engineering tool designed for precision and versatility. Made in Germany from durable zinc alloy, it features a user-friendly push button mechanism for quick adjustments and can draw circles up to 18 inches in diameter with the included beam bar. Perfect for professionals and students alike, it comes packaged in a convenient hard case for easy transport. ## Description ALVIN Compass Pro Speed Bow with Beam Bar 6" Model 205V Compass for Geometry and Engineering, Included Beam Bar Allows for Drawing Large Circles, Drawing and Architecture Tool - 6 inch ## Features - Made from zinc alloy with a matte chrome finish. Sturdy push button mechanism allows for quick adjustments, while spindles is used for finite adjustments. - Features a double break leg for precise execution of circles up to 12" inches in diameter, includes leads, beam bar and pen adapter for circles up to 18" inches in diameter. - Premium Quality - Made in Germany and designed for durability and long-lasting performance for repeated use. - Multipurpose Tool - Exactly what you need for a number of projects including bisecting angles constructing geometric shapes, including perpendicular lines parallel lines, triangles, circles, pentagons - Conveniently Packaged - Comes in a hard, see-through plastic case for portability and easy storage and transport. ## Technical Specifications | Specification | Value | |---------------|-------| | Manufacturer | ALVIN | | Brand | ALVIN | | Item Weight | 4.5 ounces | | Product Dimensions | 8 x 3 x 0.75 inches | | Item model number | 6" Pro Speed Bow Compass w/ Beam Bar | | Is Discontinued By Manufacturer | No | | Material Type | Zinc Alloy | | Number of Items | 1 | | Manufacturer Part Number | 205V | ## Images ![Compass Pro Speed Bow with Beam Bar 6" Model 205V Compass for Geometry and Engineering, Included Beam Bar Allows for Drawing Large Circles, Drawing and Architecture Tool - 6 inch - Image 1](https://m.media-amazon.com/images/I/815hHZfoZPL.jpg) ## Available Options This product comes in different **Style** options. ## Customer Reviews ### ā­ā­ā­ā­ā­ Product and Price are perfect *by G***T on August 11, 2025* Good and TrustworthyGreen Flags:Quick adjustment is top tier really really well done. better than competitors.good hand feel qualityAccurate and consistent.Full metal build will last.Reg Flags:Does not have a holder for pens so limited useBuild Tolerances is good but not the greatestBeige Flags:Price is sorta higher but is in the right spot.Feel and shape. Is very comfortable in my hand for long use cases.TLDR: Cost is more but will last a lifetime and the quality and shape and feel is well worth it. ### ā­ā­ā­ā­ Great compass, should last longer. *by G***N on July 25, 2016* This is a very good compass. It has a solid feel to it and the build material is very good as well. It comes in a plastic case which is not shown here. And that is really nice container to have to protect your investment.I've used my compass mainly for drawing, illustrations, and geometric figures and for each application it performs as you would expect. There is a compass I would rate higher, and that would be Rotring compass, but its more expensive and it takes much longer to set the radii for it; it's really meant for precision. This Alvin compass hits the sweet spot for me in terms of precision, quickness, and ease of use.Now for the bad. I've used this compass for about 2 years and its finally wearing out. I really wish it had lasted longer. The biggest problem is the jointed legs. If you look at the picture, you'll see that each leg is hinged where the screws are. No matter how tight you make the screws, the legs eventually start to bend as you use the instrument about. Its most noticeable when you are making small radius circles (because the 'elbows' bend out.) If you are careful, you can prevent the bending by gingerly twisting the compass. But that's annoying to do.Finally, the next problem I find is that the pen/pencil adapter is too narrow for some of the pens I like to use. Jetstream pens will not fit, and Uniball Signo pens barely fit. Also, to secure the writing instrument, you need to tighten a screw which 'drills' into your pen. I would much prefer the screw tightens the 'arms' embracing the pen. I'm just worried about knicking my pen with a screw mark.Overall, it's a good compass, and I plan to purchase another. Just some small adjustments would make this a much better product. First, lose the hinge to make the legs last longer. Add a 2nd adapter to allow for wider pens. ### ā­ā­ā­ā­ā­ Seems Versatile and Useful ! *by J***R on September 21, 2025* The 205V is made of a Tin Alloy (not Plastic) that is very lightweight, and is painted into a Silver color. The extender arm connected feels solid. The pencil adapter will help in multi-color circles. The speed adjust button plus micro adjust wheel work well. A few extra leads and one pin are included. The plastic case will protect the investment. No instructions, but I found an excellent video in the internet. Iā€™m super happy with my purchase. ## Frequently Bought Together - ALVIN Compass Pro Speed Bow with Beam Bar 6" Model 205V Compass for Geometry and Engineering, Included Beam Bar Allows for Drawing Large Circles, Drawing and Architecture Tool - 6 inch - SAKURA Pigma Micron Fineliner Pens - Archival Black Ink Pens - Pens for Writing, Drawing, or Bullet Journaling - Assorted Point Sizes - 6 Pack --- ## Why Shop on Desertcart? - šŸ›’ **Trusted by 1.3+ Million Shoppers** ā€” Serving international shoppers since 2016 - šŸŒ **Shop Globally** ā€” Access 737+ million products across 21 categories - šŸ’° **No Hidden Fees** ā€” All customs, duties, and taxes included in the price - šŸ”„ **15-Day Free Returns** ā€” Hassle-free returns (30 days for PRO members) - šŸ”’ **Secure Payments** ā€” Trusted payment options with buyer protection - ā­ **TrustPilot Rated 4.5/5** ā€” Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.sg/products/27355485-compass-pro-speed-bow-with-beam-bar-6-model-205v](https://www.desertcart.sg/products/27355485-compass-pro-speed-bow-with-beam-bar-6-model-205v) --- *Product available on Desertcart Singapore* *Store origin: SG* *Last updated: 2026-05-17*