{"product_id":"bolioptics-microscope-eyepiece-reticle-20mm-precise-crosshair-scale","title":"BoliOptics Microscope Eyepiece Reticle 20mm - Precise Crosshair Scale","description":"\u003cp\u003eIn this review of the BoliOptics Microscope Eyepiece Reticle the bottom line is simple: this is a purpose-built crosshair micrometer for users who need a precise, compact scale inside an eyepiece. The reticle installs into a 20mm diameter eyepiece and provides a \u003cstrong\u003e10mm\/100 division\u003c\/strong\u003e X-axis crosshair that is useful for quick measurements and alignment. Our review finds it best for lab technicians, hobby microscopists, and optics users who already know their eyepiece inner diameter and need a positive-background, high-contrast scale rather than a full grid.\u003c\/p\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n \u003cli\u003e\n\u003cstrong\u003eOptical grade glass:\u003c\/strong\u003e The reticle is made from high quality, optical grade glass for clear, distortion-free markings when viewed through a microscope.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003e20mm diameter fit:\u003c\/strong\u003e The 20mm outer diameter is compact and fits eyepieces with that inner mounting size when measured carefully.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003e10mm\/100 Divisions:\u003c\/strong\u003e The 10mm span divided into 100 increments provides fine, repeatable readings for small measurements and alignment tasks.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eX-axis crosshair scale:\u003c\/strong\u003e The single-axis crosshair reduces visual clutter while giving a precise reference line for measurements and centering.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003ePositive background:\u003c\/strong\u003e The positive background type produces dark markings on a lighter field for high contrast against many specimen types.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThe reticle is aimed at microscope users who already work with eyepiece-mounted scales: technicians, students in optics courses, amateur microscopists measuring small features, and professionals who need a simple linear reference inside their eyepiece. It is particularly useful when a single X-axis measurement or centering aid is preferred over a full reticle grid.\u003c\/p\u003e\n\u003cp\u003eUsers should measure their eyepiece inner diameter before purchase and avoid this if their eyepiece does not accept a 20mm reticle. Those who need multi-axis grids, variable scales, or built-in illumination in the reticle should look for alternative products designed for those needs.\u003c\/p\u003e\n\n\u003ch2\u003ePros \u0026amp; Cons\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n \u003cli\u003eCompact 20mm size fits eyepieces that accept this diameter and installs without altering optical path.\u003c\/li\u003e\n \u003cli\u003eHigh quality optical glass keeps markings sharp and minimizes distortion across the visible field.\u003c\/li\u003e\n \u003cli\u003eFine \u003cstrong\u003e10mm\/100 div\u003c\/strong\u003e graduation enables precise incremental measurement and repeatability.\u003c\/li\u003e\n \u003cli\u003ePositive background and clear crosshair improve visibility for many specimen types.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n \u003cli\u003eLimited to a single X-axis crosshair scale, so it is not ideal for users who need full grid reticles or multi-axis measurement.\u003c\/li\u003e\n \u003cli\u003eRequires exact measurement of the eyepiece inner diameter to ensure a proper fit.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n \u003ctr\u003e\n\u003ctd\u003eProduct\u003c\/td\u003e\n\u003ctd\u003eBoliOptics Microscope Eyepiece Reticle\u003c\/td\u003e\n\u003c\/tr\u003e\n \u003ctr\u003e\n\u003ctd\u003eReticle Type\u003c\/td\u003e\n\u003ctd\u003eX-Axis Crosshair Scale\u003c\/td\u003e\n\u003c\/tr\u003e\n \u003ctr\u003e\n\u003ctd\u003eDiameter\u003c\/td\u003e\n\u003ctd\u003e20mm\u003c\/td\u003e\n\u003c\/tr\u003e\n \u003ctr\u003e\n\u003ctd\u003eScale\u003c\/td\u003e\n\u003ctd\u003e10mm \/ 100 divisions\u003c\/td\u003e\n\u003c\/tr\u003e\n \u003ctr\u003e\n\u003ctd\u003eReticle Dimensions\u003c\/td\u003e\n\u003ctd\u003e20 x 1.5mm\u003c\/td\u003e\n\u003c\/tr\u003e\n \u003ctr\u003e\n\u003ctd\u003eBackground Type\u003c\/td\u003e\n\u003ctd\u003ePositive\u003c\/td\u003e\n\u003c\/tr\u003e\n \u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eOptical grade glass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eOur Verdict\u003c\/h2\u003e\n\u003cp\u003eThe BoliOptics 20mm crosshair reticle is a focused, cost-effective tool for anyone who needs a precise single-axis scale inside an eyepiece. It is good value when the user measures their eyepiece diameter in advance and wants a high-contrast \u003cstrong\u003e10mm\/100 div\u003c\/strong\u003e linear reference without extra visual clutter. Buy if you need a compact, reliable micrometer reticle; look elsewhere for multi-axis or larger-format reticles.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eWill this reticle fit my eyepiece?\u003c\/strong\u003e\u003cbr\u003eMeasure the inner diameter of the eyepiece at the mounting area; this reticle is sized for a 20mm fit and must match that inner diameter.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs the scale easy to read?\u003c\/strong\u003e\u003cbr\u003eYes, the positive background and optical grade glass produce clear, high-contrast markings for the 10mm\/100 division scale.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan this replace a full grid reticle?\u003c\/strong\u003e\u003cbr\u003eNo, this is a single X-axis crosshair scale intended for linear measurements and alignment; choose a full grid reticle if you need both axes.\u003c\/p\u003e","brand":"Boli Optics Inc.","offers":[{"title":"Default Title","offer_id":48638010622171,"sku":"B076PV6ZQG","price":39.94,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/41d2p9yubnL.jpg?v=1778614592","url":"https:\/\/gearmusthave.com\/products\/bolioptics-microscope-eyepiece-reticle-20mm-precise-crosshair-scale","provider":"GearMustHave","version":"1.0","type":"link"}