{"id":24139,"date":"2026-05-13T15:43:00","date_gmt":"2026-05-13T13:43:00","guid":{"rendered":"https:\/\/roder.it\/inspection\/rotation-speed-and-linear-motion\/portable-optical-and-contact-tachometers\/"},"modified":"2026-09-30T12:00:53","modified_gmt":"2026-09-30T10:00:53","slug":"portable-optical-and-contact-tachometers","status":"publish","type":"page","link":"https:\/\/roder.it\/en\/inspection\/rotation-speed-and-linear-motion\/portable-optical-and-contact-tachometers\/","title":{"rendered":"Portable optical and contact tachometers"},"content":{"rendered":"<p class=\"wp-block-paragraph\">Portable optical and contact tachometers are instruments for measuring the rotational speed (RPM) of shafts, motors, fans, turbines and rotating components in general. They come in two main technologies: optical tachometers (non-contact, based on a laser or LED beam reflected from a mark on the shaft) and contact tachometers (with a measuring wheel applied to the rotating component or to the surface of the product). They are widely used in the predictive maintenance of industrial machinery, in speed checks on production lines, in the control of electric and combustion engines, and in materials testing laboratories.  <\/p>\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n<div class=\"wp-block-cover is-light popmake-11245\" style=\"border-width:1px;border-top-left-radius:10px;border-top-right-radius:10px;border-bottom-left-radius:10px;border-bottom-right-radius:10px;min-height:250px;aspect-ratio:unset;\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"213\" class=\"wp-block-cover__image-background wp-image-14896 size-large\" alt=\"banner aiuto nella scelta dello strumento oppure della tecnologia\" src=\"https:\/\/roder.it\/wp-content\/uploads\/2026\/06\/banner_technical_support_choose_products-1024x213.png\" data-object-fit=\"cover\" srcset=\"https:\/\/roder.it\/wp-content\/uploads\/2026\/06\/banner_technical_support_choose_products-1024x213.png 1024w, https:\/\/roder.it\/wp-content\/uploads\/2026\/06\/banner_technical_support_choose_products-300x63.png 300w, https:\/\/roder.it\/wp-content\/uploads\/2026\/06\/banner_technical_support_choose_products-768x160.png 768w, https:\/\/roder.it\/wp-content\/uploads\/2026\/06\/banner_technical_support_choose_products.png 1200w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><span aria-hidden=\"true\" class=\"wp-block-cover__background has-background-dim\" style=\"background-color:#d3d6dc\"><\/span><div class=\"wp-block-cover__inner-container is-layout-constrained wp-container-core-cover-is-layout-a304f9a9 wp-block-cover-is-layout-constrained\">\n<p class=\"has-text-align-right has-ti-fg-color has-text-color has-link-color wp-elements-1 wp-block-paragraph\" style=\"font-size:clamp(21.536px, 1.346rem + ((1vw - 3.2px) * 1.726), 35px);\"><strong>Would you like help choosing the right product ?<\/strong><\/p>\n\n\n\n<div class=\"wp-block-buttons is-content-justification-right is-layout-flex wp-container-core-buttons-is-layout-b507c051 wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link wp-element-button\" href=\"https:\/\/roder.it\/en\/contacts\/\">Click here !<\/a><\/div>\n<\/div>\n<\/div><\/div>\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n<h2 class=\"wp-block-heading\">Optical tachometers<\/h2><p class=\"wp-block-paragraph\">Optical tachometers use a light beam (visible red laser, class 2 for safety) aimed at the rotating shaft: a reflective mark (an adhesive label supplied with the instrument) or a contrasting colored area reflects the beam intermittently during rotation, generating pulses at the integrated photodetector. The pulse frequency corresponds to the rotational speed in revolutions per second, converted automatically into RPM. Typical working distances are 50-500 mm, with a measuring range up to 99,999 RPM. Typical precision is 0.05% of the reading plus 1 digit. They require no physical contact with the shaft, which is particularly important for high-speed or hazardous components.    <\/p><h2 class=\"wp-block-heading\">Contact tachometers<\/h2><p class=\"wp-block-paragraph\">Contact tachometers use a measuring wheel (with a calibrated circumference, generally 6 inches or 200 mm) mounted on the body of the instrument; the wheel rests on the rotating shaft or on the surface of the moving product (strip, wire, sheet metal) and turns by friction. An internal optical encoder counts the pulses per second in order to derive the linear speed (m\/min) or, knowing the shaft diameter, the rotational speed. The typical range is up to 99,999 RPM for measurement on a shaft, and up to 1500 m\/min for measurements on moving products. They are useful wherever a reflective mark cannot be applied.   <\/p><h2 class=\"wp-block-heading\">Combined models<\/h2><p class=\"wp-block-paragraph\">Most professional instruments on the market are of the combined type (optical plus contact): a single instrument with an integrated optical sensor and a mechanical accessory for contact measurements (with an interchangeable wheel or rod). The operator selects the mode on the display according to the application, which optimizes the investment. The advanced functions integrated are: recording of maximum, minimum and mean values for analyzing speed stability; GO\/NOGO thresholds with an audible signal; an internal data logger holding thousands of values; Bluetooth\/USB data output; and PC software for archiving and spectral analysis.  <\/p><h2 class=\"wp-block-heading\">Applications<\/h2><p class=\"wp-block-paragraph\">Typical use is in: predictive maintenance of electric motors and industrial fans (checking actual speed against nominal speed); control of the operating speed of pumps, compressors and gearboxes; calibration of variable speed drives (inverters); verification of analog tachometers and panel indicators; control of line speed in continuous production (conveyor belts, processing lines for paper, plastic, textiles and metals); measurement of the linear speed of extruded, drawn and rolled products; and verification of yarn speed in the textile industry.<\/p><h2 class=\"wp-block-heading\">Standards and calibration<\/h2><p class=\"wp-block-paragraph\">Calibration of portable tachometers is carried out with reference rotation generators (rotating discs with calibrated marks, driven at a known speed by a high-precision encoder) calibrated to ISO 17025. The check covers several points across the measuring range, with calculation of the percentage error. The typical calibration interval is every six months or annual for formal quality control applications, and every two years for general use. Ambient conditions (temperature, vibration) have little influence on the performance of modern digital models.   <\/p><h2 class=\"wp-block-heading\">Selection criteria<\/h2><p class=\"wp-block-paragraph\">Selecting the right tachometer takes into account: the speed range typical of the applications; the preferred mode (optical for non-contact, contact for measurement on a line or for surfaces where no reflective mark can be applied); the accuracy class; the advanced functions (memory, data output, software); portability (size, weight, battery life); and mechanical robustness for workshop use.<\/p>\n<h2 id=\"prodotti-collegati\" class=\"wp-block-heading has-ti-accent-color has-text-color\">Related products<\/h2>\n\n<p class=\"wp-block-paragraph\">The RODER instruments for this application. Go to the relevant catalogue pages for models, technical data and documentation. <\/p>\n\n<div class=\"wp-block-group is-layout-grid wp-container-core-group-is-layout-b251d530 wp-block-group-is-layout-grid\">\n<div class=\"wp-block-group has-border-color has-white-background-color has-background is-layout-constrained wp-container-core-group-is-layout-10ff9433 wp-block-group-is-layout-constrained\" style=\"border-color:#e0e0e0;border-width:1px;border-radius:8px;padding:16px\">\n<figure class=\"wp-block-image size-large has-custom-border\"><a href=\"https:\/\/roder.it\/en\/products\/stroboscopes-for-industrial-applications\/\"><img decoding=\"async\" src=\"https:\/\/roder.it\/wp-content\/uploads\/2019\/06\/prodotti_stroboscopi.png\" alt=\"Industrial stroboscopes\" style=\"border-radius:6px;aspect-ratio:4\/3;object-fit:contain\"\/><\/a><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.385), 17px);\"><a href=\"https:\/\/roder.it\/en\/products\/stroboscopes-for-industrial-applications\/\">Industrial stroboscopes<\/a><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:14px\">Xenon and LED stroboscopes for motion analysis and RPM measurement.<\/p>\n\n\n\n<div class=\"wp-block-buttons is-layout-flex wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link has-custom-font-size wp-element-button\" href=\"https:\/\/roder.it\/en\/products\/stroboscopes-for-industrial-applications\/\" style=\"font-size:14px\">Browse the catalogue<\/a><\/div>\n<\/div>\n<\/div>\n\n<div class=\"wp-block-group has-border-color has-white-background-color has-background is-layout-constrained wp-container-core-group-is-layout-10ff9433 wp-block-group-is-layout-constrained\" style=\"border-color:#e0e0e0;border-width:1px;border-radius:8px;padding:16px\">\n<figure class=\"wp-block-image size-large has-custom-border\"><a href=\"https:\/\/roder.it\/en\/products\/optical-encoder-speed-meters\/\"><img decoding=\"async\" src=\"https:\/\/roder.it\/wp-content\/uploads\/2026\/06\/astech-velocimetri_ottici_vlm500-appl_nastro_continuo_tappeti_continui-web_image-300x300-1.webp\" alt=\"Optical speed meters and encoders\" style=\"border-radius:6px;aspect-ratio:4\/3;object-fit:contain\"\/><\/a><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.385), 17px);\"><a href=\"https:\/\/roder.it\/en\/products\/optical-encoder-speed-meters\/\">Optical speed meters and encoders<\/a><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:14px\">VLM speed meters for non-contact measurement of speed and length.<\/p>\n\n\n\n<div class=\"wp-block-buttons is-layout-flex wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link has-custom-font-size wp-element-button\" href=\"https:\/\/roder.it\/en\/products\/optical-encoder-speed-meters\/\" style=\"font-size:14px\">Browse the catalogue<\/a><\/div>\n<\/div>\n<\/div>\n<\/div>\n\n<div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\">\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h4 class=\"wp-block-heading has-ti-accent-color has-text-color has-link-color wp-elements-2\">Contacts &amp; Information<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Contact for general information : <a href=\"mailto:info@roder.it\">info@roder.it<\/a><br\/><br\/>Machine Vision Division of RODER : <a href=\"http:\/\/www.rodervision.com\">www.rodervision.com<\/a><br\/>RODER Instruments Division : <a href=\"http:\/\/www.rodervision.com\">www.innovacheck.com<\/a><br\/>More about RODER : <a href=\"https:\/\/roder.it\/en\/contacts\/\">about us<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The information contained in this website is provided for information purposes only. Although it has been prepared with the greatest care, it does not constitute a contractual offer or a binding commitment to supply. It may contain transcription, translation or typographical errors. For precise and up-to-date information, please contact our company directly.   <\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Note:<\/strong> Some images on this website have been intentionally generated using artificial intelligence (AI). This is because, for many applications and projects, photographs of the actual installation or system cannot be disclosed owing to confidentiality agreements, contractual clauses and non-disclosure agreements (NDAs). <\/p>\n\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Tachometers for measuring RPM without contact (laser\/optical) and by contact, including linear speed measurement.<\/p>\n","protected":false},"author":157040980,"featured_media":0,"parent":19425,"menu_order":1,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_yoast_wpseo_focuskw":"","_yoast_wpseo_title":"","_yoast_wpseo_metadesc":"","_coblocks_attr":"","_coblocks_dimensions":"","_coblocks_responsive_height":"","_coblocks_accordion_ie_support":"","_wpcom_ai_launchpad_about_page":false,"_wpcom_ai_launchpad_gallery_page":false,"_wpcom_ai_launchpad_contact_page":false,"_wpcom_ai_launchpad_events_page":false,"_wpcom_ai_launchpad_video_page":false,"_wpcom_ai_launchpad_portfolio_piece":false,"footnotes":""},"class_list":["post-24139","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.6 - 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Speed measurements are used to obtain information on the production speed of equipment, the speed of goods transport and the speed of the assembly process. The instruments used to take these measurements are highly precise and ensure\u2026","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"roder misura di velocit\u00e0 icona common","src":"https:\/\/i0.wp.com\/roder.it\/wp-content\/uploads\/2019\/05\/icona_velocita.png?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]},{"id":19329,"url":"https:\/\/roder.it\/en\/inspection\/diameter-ovality-profile-and-form\/","url_meta":{"origin":24139,"position":2},"title":"Diameter, ovality, profile and form","author":"GSM","date":"13 May 2026","format":false,"excerpt":"Laser and optical systems for measuring diameter, ovality, profile, width and form on finished products or in line.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":18306,"url":"https:\/\/roder.it\/en\/products\/optical-encoder-speed-meters\/","url_meta":{"origin":24139,"position":3},"title":"Optical encoder speed meters","author":"GSM","date":"27 June 2026","format":false,"excerpt":"Non-contact optical speed meters and encoders for the precise measurement of speed and length in continuous industrial processes. Optical encoder speed meters measure the speed and length of moving materials with no mechanical contact at all, eliminating the slip and wear typical of measuring wheels. 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