{"product_id":"staedtler-551-02-mars-comfort-precision-masterbow-compass-with-extension-bar","title":"Staedtler Mars Comfort Precision Masterbow Compass with Extension Bar 551 02","description":"\u003ch2\u003eCentre Wheel Precision With Extra Reach\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eStaedtler Mars comfort 551 02 is the 551 precision masterbow compass packed with an extension bar, taking its maximum circle from about 280mm to about 500mm.\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eLarge circles are where a compass most often lets you down, because a wide setting magnifies any slip. This set pairs the long reach of an extension bar, which fits the needle leg exactly, with a centre wheel on a spindle guide that holds the setting fixed. Both figures are given by Staedtler on their Australian site and in their 2024 catalogue.\u003c\/p\u003e\u003cp\u003eThe compass itself is solid metal, 154mm long, with a spring-bow head, a hinged leg joint and needle shoe, an interchangeable shouldered needle and a lead part with a 4mm shank. In the hinged case you also get a universal adapter, so drafting pens and fineliners can draw the circle in ink, and a spares box. The catalogue describes the compass as nickel-free.\u003c\/p\u003e\u003cp\u003eTypical uses are plan views of round tables and roundabouts, arcs on site plans and large construction geometry.\u003c\/p\u003e\u003cp\u003eMore \u003ca href=\"\/collections\/geometry-compasses\"\u003egeometry compasses\u003c\/a\u003e, \u003ca href=\"\/collections\/scale-rulers\"\u003escale rulers\u003c\/a\u003e and \u003ca href=\"\/collections\/geometry-kits\"\u003etechnical drawing tools\u003c\/a\u003e.\u003c\/p\u003e","brand":"Staedtler","offers":[{"title":"Default Title","offer_id":50552460574976,"sku":"SR551 02","price":61.71,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0863\/5419\/8784\/files\/Staedtler_Mars_Comfort_551_Compass_Extension_Bar_551-02_1_Mega_Office_Supplies.jpg?v=1791399776","url":"https:\/\/megaschoolsupplies.com.au\/products\/staedtler-551-02-mars-comfort-precision-masterbow-compass-with-extension-bar","provider":"Mega School Supplies","version":"1.0","type":"link"}