{"id":9965,"date":"2026-09-18T07:08:25","date_gmt":"2026-09-18T07:08:25","guid":{"rendered":"https:\/\/www.endoscopi-industriali.it\/come-scegliere-il-diametro-della-sonda-di-un-videoendoscopio-industriale\/"},"modified":"2026-09-21T08:37:22","modified_gmt":"2026-09-21T08:37:22","slug":"come-scegliere-il-diametro-della-sonda-di-un-videoendoscopio-industriale","status":"publish","type":"post","link":"https:\/\/www.endoscopi-industriali.it\/en\/come-scegliere-il-diametro-della-sonda-di-un-videoendoscopio-industriale\/","title":{"rendered":"How to Choose the Probe Diameter of an Industrial Videoscope"},"content":{"rendered":"<div class=\"wpb-content-wrapper\"><p>[vc_row][vc_column][vc_column_text css=&#8221;&#8221;]The correct diameter is not necessarily the smallest available: it must be compatible with the actual inspection path, the geometry of the component, and the purpose of the inspection.<\/p>\n<h4><strong>In brief<\/strong><\/h4>\n<p>To choose the probe diameter of an industrial videoscope, the entire inspection path must be considered, not just the entry opening. It is important to check the minimum available clearance, any restrictions and bends along the path, the distance to be reached, the space available inside the cavity, and the type of inspection to be performed. Diameters such as <strong>2.0 mm, 2.8 mm, 3.9\u20134.0 mm and 6.0 mm<\/strong> are designed to meet different application requirements.<\/p>\n<p>A thinner probe provides greater access possibilities, but it is not automatically the best choice when there is enough space to use a larger diameter.<\/p>\n<p>Probe diameter is one of the first parameters to consider when configuring an industrial videoscope. However, reducing the decision to \u201cwhat is the smallest probe that will fit?\u201d often leads to an incomplete choice. A more useful question is:<\/p>\n<p><strong>Which probe diameter will allow the inspection point to be reached and properly observed under the actual inspection conditions?<\/strong><\/p>\n<aside class=\"answer-box\" aria-label=\"Risposta in breve\"><\/aside>\n<p>[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column][vc_single_image image=&#8221;9967&#8243; img_size=&#8221;full&#8221; alignment=&#8221;center&#8221; css=&#8221;&#8221;][\/vc_column][\/vc_row][vc_row][vc_column][vc_column_text css=&#8221;&#8221;]<\/p>\n<h4><strong>Why is probe diameter so important?<\/strong><\/h4>\n<p><strong>The diameter primarily determines where the probe can physically pass, but on its own it does not describe the overall capabilities of a videoscope.<\/strong><\/p>\n<p>In a real inspection, the entry point is only the beginning. Further along the inspection path, there may be restrictions, bends, changes in direction, obstacles, or surfaces that need to be viewed from a position that is not immediately accessible.<\/p>\n<p>For this reason, probe diameter should be evaluated together with factors such as probe length, path geometry, probe behaviour during insertion, articulation capability, and viewing direction, according to the characteristics of the specific system.<\/p>\n<p>&nbsp;<\/p>\n<h4><strong>Is it always better to choose the thinnest probe?<\/strong><\/h4>\n<p><strong>No. A thinner probe is necessary when access space requires it, but it is not automatically the best configuration for every inspection.<\/strong><\/p>\n<p>If the available passage is extremely narrow, reducing the probe diameter may be essential. However, if the component allows the use of a larger probe, the choice should be made by comparing the overall characteristics of the compatible configurations.<\/p>\n<p>\u2190 Greater priority on accessibility | Greater configuration flexibility \u2192<\/p>\n<p><strong>\u00d8 2.0 mm<\/strong><br \/>\nExtremely restricted access<\/p>\n<p><strong>\u00d8 2.8 mm<\/strong><br \/>\nHigh accessibility<\/p>\n<p><strong>\u00d8 3.9\u20134.0 mm<\/strong><br \/>\nIntermediate class<\/p>\n<p><strong>\u00d8 6.0 mm<\/strong><br \/>\nWhen more space is available<\/p>\n<p><strong>Note:<\/strong> Probe diameter alone does not determine resolution, image quality, articulation, illumination, or other performance characteristics. These depend on the specific model and configuration.<\/p>\n<p>&nbsp;<\/p>\n<h4><strong>What factors determine the correct probe diameter?<\/strong><\/h4>\n<p>&nbsp;<\/p>\n<h5><strong>1. What is the actual minimum clearance?<\/strong><\/h5>\n<p>The nominal diameter of the entry opening is not the only measurement to consider. It is necessary to identify <strong>the most restrictive section along the entire path<\/strong> that the probe will have to pass through.<\/p>\n<p>Tolerances, edges, deposits, deformation, or misalignment can reduce the actual usable clearance.<\/p>\n<h5><strong>2. Is the path straight or does it include bends?<\/strong><\/h5>\n<p>Two components with the same access opening may require different solutions. An almost straight path is very different from a geometry involving several changes in direction before reaching the inspection area.<\/p>\n<h5><strong>3. How far away is the area to be inspected?<\/strong><\/h5>\n<p><strong>Diameter and length must be evaluated together.<\/strong> A probe that fits correctly but cannot reach the point of interest does not solve the inspection requirement.<\/p>\n<h5><strong>4. How much space is available after passing through the entry point?<\/strong><\/h5>\n<p>A small opening may lead into a large cavity, or the component may remain narrow throughout most of the inspection path. These are different application conditions and require different evaluations.<\/p>\n<h5><strong>5. What actually needs to be inspected?<\/strong><\/h5>\n<p>The operator may need to inspect a surface, identify an anomaly, examine a side wall, check for deposits or foreign objects, photographically document an area, or reach a hidden point behind a complex geometry. <strong>The inspection objective comes before the choice of equipment.<\/strong><\/p>\n<p>&nbsp;<\/p>\n<h4><strong>Which probe diameter should you choose?<\/strong><\/h4>\n<p>There is no universally best diameter. It is more useful to consider the different sizes as application classes.<\/p>\n<p><strong>\u00d8 2.0 mm<\/strong> \u2014 Best suited to applications where extremely restricted access is the primary consideration.<\/p>\n<p><strong>\u00d8 2.8 mm<\/strong> \u2014 High accessibility without necessarily requiring the smallest available diameter.<\/p>\n<p><strong>\u00d8 3.9\u20134.0 mm<\/strong> \u2014 An intermediate range to be evaluated according to the inspection path.<\/p>\n<p><strong>\u00d8 6.0 mm<\/strong> \u2014 Suitable for applications where available space is less restrictive.<\/p>\n<p>&nbsp;<\/p>\n<h4><strong>When can a \u00d8 2.0 mm probe be useful?<\/strong><\/h4>\n<p><strong>A 2.0 mm probe is suitable when extremely restricted access is the main constraint of the inspection.<\/strong> It is particularly useful when just a few millimetres determine whether or not the area to be inspected can be reached.[\/vc_column_text][vc_single_image image=&#8221;9969&#8243; img_size=&#8221;full&#8221; alignment=&#8221;center&#8221; css=&#8221;&#8221;][\/vc_column][\/vc_row][vc_row][vc_column][vc_column_text css=&#8221;&#8221;]<\/p>\n<h4><strong>When should you choose a \u00d8 2.8 mm probe?<\/strong><\/h4>\n<p><strong>The 2.8 mm class maintains excellent accessibility when space is very limited, without necessarily requiring the smallest possible diameter.<\/strong> It can be a practical choice when a 2.0 mm probe is not essential, but the inspection path does not allow the use of a 4 or 6 mm class probe.<\/p>\n<h4><strong>When should you choose a \u00d8 3.9\u20134.0 mm class probe?<\/strong><\/h4>\n<p><strong>The 3.9\u20134.0 mm class offers an intermediate solution between accessibility and configuration flexibility.<\/strong> However, 3.9 mm and 4.0 mm should not automatically be considered equivalent: in critical passages, even a few tenths of a millimeter can make a significant difference.<\/p>\n<h4><strong>When might a \u00d8 6.0 mm probe be preferable?<\/strong><\/h4>\n<p><strong>When the access point and internal inspection path do not require a very small diameter, a 6.0 mm probe can be considered without unnecessarily reducing the probe diameter.<\/strong> The final choice should always be based on the specific configuration and the required functions.[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column][vc_single_image image=&#8221;9971&#8243; img_size=&#8221;full&#8221; alignment=&#8221;center&#8221; css=&#8221;&#8221;][\/vc_column][\/vc_row][vc_row][vc_column][vc_column_text css=&#8221;&#8221;]<\/p>\n<h4><strong>Is the diameter of the entry hole enough to choose the probe?<\/strong><\/h4>\n<p><strong>No. The entry hole is only one of the parameters that needs to be measured.<\/strong> An apparently large entry point may be followed by a restriction, fitting, bend, or internal obstacle.<\/p>\n<p><strong>Practical rule:<\/strong> ideally reconstruct the inspection path as <strong>ENTRY \u2192 RESTRICTIONS \u2192 BENDS \u2192 DISTANCE \u2192 AREA TO BE INSPECTED<\/strong>. The correct probe diameter is determined by considering all these factors together.<\/p>\n<h4><strong>How important are bends and restrictions?<\/strong><\/h4>\n<p><strong>Bends and restrictions can be more critical than the diameter of the initial entry hole.<\/strong> The probe must not only enter the component, but also advance all the way to the area of interest.<\/p>\n<p>In complex geometries, it is important to evaluate the number and position of bends, changes in cross-section, the distance between changes in direction, the space available to orient the distal section, and the design characteristics of the selected configuration.[\/vc_column_text][vc_single_image image=&#8221;9973&#8243; img_size=&#8221;full&#8221; alignment=&#8221;center&#8221; css=&#8221;&#8221;][vc_column_text css=&#8221;&#8221;]<\/p>\n<h3><strong>Five Practical Examples of Probe Selection<\/strong><\/h3>\n<h5><strong>Case 1 \u2013 Extremely Small Access Hole<\/strong><\/h5>\n<p>The area to be inspected is located immediately behind a very small opening. <strong>Priority: accessibility.<\/strong> In this case, it makes sense to start with the smallest probe diameter classes that are compatible with the available passage.<\/p>\n<h5><strong>Case 2 \u2013 Large Entry Point but Internal Restriction<\/strong><\/h5>\n<p>The initial opening is sufficiently large, but the inspection path subsequently becomes narrower. <strong>Priority: measure the most critical point along the entire inspection path.<\/strong><\/p>\n<h5><strong>Case 3 \u2013 Inspection Path with Several Bends<\/strong><\/h5>\n<p>The available diameter is sufficient, but the probe must pass through several changes in direction. <strong>Priority: evaluate diameter, length, geometry, and the behaviour of the selected configuration together.<\/strong><\/p>\n<h5><strong>Case 4 \u2013 Large Internal Cavity<\/strong><\/h5>\n<p>The access point is sufficiently large and there is ample space inside the component. <strong>Priority: inspection objective.<\/strong> In this situation, there is not necessarily an advantage in using the smallest possible diameter.<\/p>\n<h5><strong>Case 5 \u2013 Pipe or System with a Significant Inspection Distance<\/strong><\/h5>\n<p>The pipe diameter is not a limiting factor, but the area to be reached is far from the entry point. <strong>Priority: evaluate probe diameter and length at the same time.<\/strong><\/p>\n<h4><strong>What Mistakes Should Be Avoided?<\/strong><\/h4>\n<ol>\n<li><strong>Automatically choosing the smallest probe.<\/strong> The minimum diameter is useful when necessary, but it is not a universal rule.<\/li>\n<li><strong>Measuring only the entry hole.<\/strong> The actual limiting point may be further along the inspection path.<\/li>\n<li><strong>Ignoring bends and changes in direction.<\/strong> Geometry can affect accessibility more than the initial opening.<\/li>\n<li><strong>Considering diameter and length separately.<\/strong> These two parameters should be evaluated together.<\/li>\n<li><strong>Choosing the instrument before defining the inspection objective.<\/strong> First determine what needs to be observed.<\/li>\n<li><strong>Assuming performance based on diameter alone.<\/strong> Resolution, articulation, viewing capabilities, and other characteristics depend on the specific system.<\/li>\n<\/ol>\n<h4><strong>Checklist: What to Check Before Choosing<\/strong><\/h4>\n<p>\u2610 What is the minimum diameter actually available?<\/p>\n<p>\u2610 Is the entry hole the narrowest point?<\/p>\n<p>\u2610 Are there any internal restrictions?<\/p>\n<p>\u2610 How many bends must the probe pass through?<\/p>\n<p>\u2610 How far away is the area to be inspected?<\/p>\n<p>\u2610 How much space is available once the cavity is reached?<\/p>\n<p>\u2610 Does the distal section need to be articulated?<\/p>\n<p>\u2610 Is the surface to be inspected frontal, lateral, or hidden?<\/p>\n<p>\u2610 What detail needs to be identified or documented?<\/p>\n<p>\u2610 What features must the inspection system provide?<\/p>\n<h4><strong>Frequently Asked Questions About Videoscope Probe Diameters<\/strong><\/h4>\n<p><strong>What is the best probe diameter for an industrial videoscope?<\/strong><\/p>\n<p>There is no universally best diameter. The correct diameter is the one that is compatible with the entire access path and with the features required to perform the inspection.<\/p>\n<p><strong>Is a 2 mm probe always better than a 4 or 6 mm probe?<\/strong><\/p>\n<p>No. A 2 mm probe is useful when extremely restricted access requires it. If more space is available, a larger diameter may also be suitable depending on the specific inspection requirements.<\/p>\n<p><strong>Is knowing the diameter of the entry hole enough?<\/strong><\/p>\n<p>No. The entry hole is only one part of the inspection path. Internal restrictions, bends, changes in direction, and other obstacles must also be considered.<\/p>\n<p><strong>Which probe diameter should be chosen for a pipe?<\/strong><\/p>\n<p>It depends on the pipe geometry, the minimum internal clearance, any bends or restrictions, the inspection distance, and the area that needs to be observed.<\/p>\n<p><strong>Does probe diameter affect image quality?<\/strong><\/p>\n<p>Probe diameter alone does not determine image quality. Resolution, sensor characteristics, optics, illumination, and other factors depend on the specific videoscope and configuration.<\/p>\n<p><strong>Does probe diameter determine probe articulation?<\/strong><\/p>\n<p>No. Articulation depends on the design and configuration of the specific probe and videoscope system.<\/p>\n<p><strong>Can I choose a probe diameter exactly equal to the available opening?<\/strong><\/p>\n<p>The nominal dimensions alone are not sufficient. Actual clearance can be affected by tolerances, edges, deposits, deformation, or misalignment, so the complete inspection path should always be evaluated.<\/p>\n<p><strong>Can 3.9 mm and 4.0 mm be considered equivalent?<\/strong><\/p>\n<p>Not necessarily. In very restricted passages, even a difference of a few tenths of a millimetre can be significant.<\/p>\n<h4><strong>The Right Probe Is the One Suited to the Inspection<\/strong><\/h4>\n<p>Choosing the diameter of a videoscope probe should begin with the component to be inspected: the inspection path, the narrowest point, bends, distance, and the information that needs to be obtained.<\/p>\n<p><strong>The correct probe is not necessarily the one with the smallest diameter, but the one that allows the point of interest to be reached and properly observed under the actual inspection conditions.<\/strong><\/p>\n<p>New technical insights and selection tools from COBB Industrial Endoscopes will be available soon.[\/vc_column_text][\/vc_column][\/vc_row]<\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>[vc_row][vc_column][vc_column_text css=&#8221;&#8221;]The correct diameter is not necessarily the smallest available: it must be compatible with the actual inspection path, the geometry of the component, and the purpose of the inspection. In brief To choose the probe diameter of an industrial videoscope, the entire inspection path must be considered, not just the entry opening. It is&#8230; [&#8230;]<\/p>\n<p><a class=\"btn btn-secondary understrap-read-more-link\" href=\"https:\/\/www.endoscopi-industriali.it\/en\/come-scegliere-il-diametro-della-sonda-di-un-videoendoscopio-industriale\/\">Read More&#8230;<\/a><\/p>\n","protected":false},"author":2,"featured_media":9960,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"inline_featured_image":false,"footnotes":""},"categories":[3],"tags":[],"acf":[],"_links":{"self":[{"href":"https:\/\/www.endoscopi-industriali.it\/en\/wp-json\/wp\/v2\/posts\/9965"}],"collection":[{"href":"https:\/\/www.endoscopi-industriali.it\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.endoscopi-industriali.it\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.endoscopi-industriali.it\/en\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.endoscopi-industriali.it\/en\/wp-json\/wp\/v2\/comments?post=9965"}],"version-history":[{"count":3,"href":"https:\/\/www.endoscopi-industriali.it\/en\/wp-json\/wp\/v2\/posts\/9965\/revisions"}],"predecessor-version":[{"id":9977,"href":"https:\/\/www.endoscopi-industriali.it\/en\/wp-json\/wp\/v2\/posts\/9965\/revisions\/9977"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.endoscopi-industriali.it\/en\/wp-json\/wp\/v2\/media\/9960"}],"wp:attachment":[{"href":"https:\/\/www.endoscopi-industriali.it\/en\/wp-json\/wp\/v2\/media?parent=9965"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.endoscopi-industriali.it\/en\/wp-json\/wp\/v2\/categories?post=9965"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.endoscopi-industriali.it\/en\/wp-json\/wp\/v2\/tags?post=9965"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}