--- product_id: 667423907 title: "Concise Ruler Circular Calculator Machine Tool 100867" brand: "concise" price: "€ 96.88" currency: EUR in_stock: true reviews_count: 12 url: https://www.desertcart.be/products/667423907-concise-ruler-circular-calculator-machine-tool-100867 store_origin: BE region: Belgium --- # 4.7" Diameter Vinyl Chloride Material Precision Tool Concise Ruler Circular Calculator Machine Tool 100867 **Brand:** concise **Price:** € 96.88 **Availability:** βœ… In Stock ## Summary > πŸ” Calculate with Style! ## Quick Answers - **What is this?** Concise Ruler Circular Calculator Machine Tool 100867 by concise - **How much does it cost?** € 96.88 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.be](https://www.desertcart.be/products/667423907-concise-ruler-circular-calculator-machine-tool-100867) ## Best For - concise enthusiasts ## Why This Product - Trusted concise brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - β€’ **Compact Design:** Perfectly sized at 4.7 inches for easy portability. - β€’ **Sleek Aesthetic:** A modern tool that complements any professional setting. - β€’ **Durable Material:** Crafted from high-quality vinyl chloride for long-lasting use. - β€’ **Precision Meets Style:** Elevate your workspace with this sleek circular calculator. - β€’ **Versatile Functionality:** Ideal for professionals needing quick calculations on the go. ## Overview The Concise Ruler Circular Calculator Machine Tool 100867 features a compact 4.7-inch diameter and is made from durable vinyl chloride, making it an essential tool for professionals who value precision and aesthetics in their workspace. ## Description This is a calculation scale designed to calculate the main processing time when using machine tools (drilling machine, lathe, milling machine, paper, etc.). Designed for technicians. Back side: List of cutting speeds for mild steel and semi-steel cast iron; Dedicated storage case, instruction manual included. ## Features - Size: Diameter: Approx. 4.7 inches (120 mm) - Main Material: Vinyl chloride ## Images ![Concise Ruler Circular Calculator Machine Tool 100867 - Image 1](https://m.media-amazon.com/images/I/71BjmN1Fq5L.jpg) ![Concise Ruler Circular Calculator Machine Tool 100867 - Image 2](https://m.media-amazon.com/images/I/71S+pzDNEML.jpg) ![Concise Ruler Circular Calculator Machine Tool 100867 - Image 3](https://m.media-amazon.com/images/I/61CErawqNOL.jpg) ![Concise Ruler Circular Calculator Machine Tool 100867 - Image 4](https://m.media-amazon.com/images/I/21MF7e+b41L.jpg) ![Concise Ruler Circular Calculator Machine Tool 100867 - Image 5](https://m.media-amazon.com/images/I/81LaW79WAzL.jpg) ## Available Options This product comes in different **Style** options. ## Customer Reviews ### ⭐⭐⭐⭐⭐ 5.0 out of 5 stars great slide rule for learning *by B***D on Reviewed in the United States on May 8, 2024* I bought this slide rule as a backup to the Picket and Keuffel and Esser slide rules I bought on eBay (both like new condition). I thought this slide rule would be cheaply made but its not, its made of thick durable plastic. What surprised me is that the Picket slide rule was impossible to read even with my glasses on and the Keuffel and Esser is very hard to read as it has very find lines. So this Concise slide rule turned out to be very readable and so much easier to use. It would be nice if Concise could make a regular slide rule rather than just a circular one as it would be much better than the old kind which were made of metal and wood. Some other reviewers of this slide rule said that the numbers dont line up and showed pics to prove it. I didnt not have that problem with the slide rule I got. So hopefully that was a temporary defect that they found and corrected. ### ⭐⭐⭐⭐⭐ 5.0 out of 5 stars English Instruction Manual on Slide Rule Museum Website *by J***H on Reviewed in the United States on November 4, 2023* The 28N is handy because it fits in a shirt pocket. The C and D scales are great for conversions and great for travel calculations (it is basically e6b flight computer pilots are trained on) this does come with English instructions. I also use this in the kitchen for doing unit conversions and scaling servings in a recipe. For example the recipe is for two servings and I want nine. I dial it in and can look up how much of each ingredient to use as I’m cooking (instead of stopping to pound out each conversion manually on a calculator).The 270 is a great slide rule. Unlike the 28N this has a great quality tactile feel. The english manual can be downloaded from the Slide Rule Museum website are really good. They go over some nifty tricks including ways to solve various trig problems.The 300 is of the same quality as the 270 but also has LL2 and LL3 scales. Everything is aligned properly. This is now my favorite. The trig scales are read differently on the 300 than the 270 so that may be why some people think it’s off. I just saw a video on youtube show how to use the log log scales to calculate interest. It’s neat because you can just lookup when it will double or triples. You can put the number of times it compounds per year as well. It’s much easier than typing in the compounding formula on a scientific calculator and gives a ton of results with one setting. Of course you can use them for other power and exponent calculations as well. ### ⭐⭐⭐⭐ 4.0 out of 5 stars Concise 300 Slide Rule *by J***S on Reviewed in the United States on November 18, 2023* The Concise 300 is a seriously capable 4" circular duplex slide rule. Scales on the front are K, A, D, C, CI, B, and L. On the reverse are LL1, LL2, LL3,D, C, S, T1, T2, and ST scales. Scales are engraved, clear and well aligned. The central slide rings on both sides move smoothly, as does the cursor.I have tested its most basic scales and found them quite accurate, well aligned and easy to read. I'm not yet familiar with all the scales on this model but have no reason to doubt they are equally well executed.The construction is sturdy and should be durable.My one complaint is the instructions are only in Japanese. I was able to download a set of instructions in English from a third party site. Failure to include them with the rule as shipped is a deficiency because the Concise circular rule operates differently from others like the older Picketts, and has different scales arrangements that require some significant changes in how the rule is manipulatedThe size of the 300 makes it too large for most shirt pockets. But, it will fit in most larger jacket or suit pockets.Aside from the issue with the instructions, the Concise 300 isa very satisfactory tool, easy to set and read with good precision, well made and darned convenient. --- ## Why Shop on Desertcart? - πŸ›’ **Trusted by 1.3+ Million Shoppers** β€” Serving international shoppers since 2016 - 🌍 **Shop Globally** β€” Access 737+ million products across 21 categories - πŸ’° **No Hidden Fees** β€” All customs, duties, and taxes included in the price - πŸ”„ **15-Day Free Returns** β€” Hassle-free returns (30 days for PRO members) - πŸ”’ **Secure Payments** β€” Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** β€” Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.be/products/667423907-concise-ruler-circular-calculator-machine-tool-100867](https://www.desertcart.be/products/667423907-concise-ruler-circular-calculator-machine-tool-100867) --- *Product available on Desertcart Belgium* *Store origin: BE* *Last updated: 2026-04-28*