{"id":1736,"date":"2026-04-24T08:18:47","date_gmt":"2026-04-24T08:18:47","guid":{"rendered":"https:\/\/novanta.com\/precision-medicine\/product\/spectrascan-pr-655\/"},"modified":"2026-06-04T14:20:37","modified_gmt":"2026-06-04T14:20:37","slug":"photo-research-pr-655","status":"publish","type":"product","link":"https:\/\/novanta.com\/precision-medicine\/product\/photo-research-pr-655\/","title":{"rendered":"Photo Research\u00ae SpectraScan\u00ae PR-655"},"content":{"rendered":"\n\n<div class=\"hero alignfull hero--wide hero--medium has-overlay has-overlay-dark\">\n\t\t\t\t\t<figure class=\"hero__image-wrap\">\n\t\t\t\t<img decoding=\"async\" width=\"2560\" height=\"853\" src=\"https:\/\/novanta.com\/precision-medicine\/wp-content\/uploads\/sites\/36\/2026\/04\/product-header.jpg?quality=85&amp;strip=all&amp;w=2560\" class=\"attachment-design-max size-design-max\" alt=\"\" fetchpriority=\"high\" srcset=\"https:\/\/novanta.com\/precision-medicine\/wp-content\/uploads\/sites\/36\/2026\/04\/product-header.jpg?resize=320%2C107&amp;quality=85&amp;strip=all 320w, https:\/\/novanta.com\/precision-medicine\/wp-content\/uploads\/sites\/36\/2026\/04\/product-header.jpg?resize=400%2C133&amp;quality=85&amp;strip=all 400w, https:\/\/novanta.com\/precision-medicine\/wp-content\/uploads\/sites\/36\/2026\/04\/product-header.jpg?resize=840%2C280&amp;quality=85&amp;strip=all 840w, https:\/\/novanta.com\/precision-medicine\/wp-content\/uploads\/sites\/36\/2026\/04\/product-header.jpg?resize=1200%2C400&amp;quality=85&amp;strip=all 1200w, https:\/\/novanta.com\/precision-medicine\/wp-content\/uploads\/sites\/36\/2026\/04\/product-header.jpg?resize=1680%2C560&amp;quality=85&amp;strip=all 1680w, https:\/\/novanta.com\/precision-medicine\/wp-content\/uploads\/sites\/36\/2026\/04\/product-header.jpg?resize=1920%2C640&amp;quality=85&amp;strip=all 1920w\" sizes=\"(max-width: 2560px) 100vw, 2560px\" \/>\t\t\t<\/figure>\n\t\t\t\n\t\n\t\n<div class=\"hero__content hero__content--vertical-align-bottom\" style=\"--one-novanta-hero-pre-heading-acent-line-color: #4bb295\">\n\t<div class=\"hero__content-wrap has-medium-font-size has-heading-font-family\">\n\t\t\t\t\t<p class=\"hero__pre-heading shiny-text\">\n\t\t\t\tlight and color measurment\t\t\t<\/p>\n\t\t\n\t\t<h1 class=\"hero__heading line-expanding has-display-font-size\">\n\t\t\tPhoto Research\u00ae SpectraScan\u00ae PR-655 Spectroradiometer\t\t<\/h1>\n\n\t\t<p>Part Number: 6655-0001-00<\/p>\t<\/div>\n<\/div>\n<\/div>\n\n\n\n<div class=\"alignfull is-layout-constrained wp-block-one-novanta-section-is-layout-constrained\" style=\"padding-top:var(--wp--preset--spacing--80);padding-bottom:var(--wp--preset--spacing--80)\">\n<div class=\"wp-block-one-novanta-section-content alignwide\"><\/div>\n<\/div>\n\n\n\n<div class=\"alignfull has-secondary-background-color has-background is-layout-constrained wp-block-one-novanta-section-is-layout-constrained\" id=\"one-novanta-single-product-all-features\" style=\"padding-top:var(--wp--preset--spacing--20);padding-bottom:var(--wp--preset--spacing--80)\">\n<div class=\"wp-block-one-novanta-section-content alignwide\">\n<rt-tabs class=\"novanta-tabs-wrapper\" current-tab=\"tab-overview-features-1\" >\n\n\t<rt-tabs-nav class=\"novanta-tabs-nav\">\n\t\t\t\t\t\t\t\t<rt-tabs-nav-item class=\"novanta-tabs-nav__item has-medium-font-size\"  active=\"yes\">\n\t\t\t\t<a class=\"has-foreground-color\" href=\"#tab-overview-features-1\">Overview &amp; Features<\/a>\n\t\t\t<\/rt-tabs-nav-item>\n\n\t\t\t\t\t\t\t\t\t\t\t<rt-tabs-nav-item class=\"novanta-tabs-nav__item has-medium-font-size\" >\n\t\t\t\t<a class=\"has-foreground-color\" href=\"#tab-documents-downloads-2\">Documents &amp; Downloads<\/a>\n\t\t\t<\/rt-tabs-nav-item>\n\n\t\t\t\t\t\t<\/rt-tabs-nav>\n\n\t\t\t\t\t<rt-tabs-tab id=\"tab-overview-features-1\"  open=\"yes\">\n\t\t\t\t\t\n<div class=\"alignfull is-layout-constrained wp-block-one-novanta-section-is-layout-constrained\" style=\"padding-top:0;padding-bottom:0\">\n<div class=\"wp-block-one-novanta-section-content alignwide\">\n<div class=\"two-columns--media-align-left wp-block-one-novanta-fifty-fifty-wrapper two-columns two-columns--vertical-align-top\">\n\t\n<div class=\"two-columns__column\">\n\t<h2 class=\"one-novanta-50-50-wrapper__heading has-xx-large-font-size\">Overview<\/h2><\/div>\n\n<div class=\"two-columns__column\">\n\t\n<div class=\"wp-block-one-novanta-fifty-fifty-wrapper alignfull\">\n<p class=\"has-medium-font-size\"><strong>Features and Benefits<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list has-medium-font-size\">\n<li>Precise and Accurate Spectra Based Measurements<\/li>\n\n\n\n<li>Wide Dynamic Range<\/li>\n\n\n\n<li>Battery Powered for Absolute Mobility<\/li>\n\n\n\n<li>USB and Optional Bluetooth Interface<\/li>\n\n\n\n<li>Full Color Touch Screen<\/li>\n\n\n\n<li>SD Memory<\/li>\n<\/ul>\n\n\n\n<p class=\"has-medium-font-size\"><strong>Applications<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list has-medium-font-size\">\n<li>Display Luminance, Color, and Contrast<\/li>\n\n\n\n<li>Reflectance and Transmittance<\/li>\n\n\n\n<li>CRT, LCD, PDP, and Projector White Balance Calibration<\/li>\n\n\n\n<li>LED Testing<\/li>\n\n\n\n<li>Digital Cinemas<\/li>\n\n\n\n<li>Surface testing, e.g. paper, ink, and textiles<\/li>\n\n\n\n<li>Film and Video Post-production<\/li>\n\n\n\n<li>Medical\/Dental Color Testing<\/li>\n\n\n\n<li>Automotive and Aerospace Display Testing<\/li>\n<\/ul>\n\n\n\n<div class=\"wp-block-buttons is-layout-flex wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button has-arrow type-light\"><a class=\"wp-block-button__link has-primary-blue-background-color has-background wp-element-button\" href=\"https:\/\/novanta.com\/precision-medicine\/contact\/\">Speak to our experts<\/a><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n\t\t\t\t<\/rt-tabs-tab>\n\n\t\t\t\t\t\t\t<rt-tabs-tab id=\"tab-documents-downloads-2\" >\n\t\t\t\t\t\n<div class=\"align wp-block-one-novanta-documents wp-one-novanta-table wp-one-novanta-table--has-background--secondary\">\n\n\t<div class=\"wp-one-novanta-table__header\">\n\t\t\n\t\n<div class=\"wp-one-novanta-table__filter one-novanta-filter-dropdown\" data-filter-column=\"2\">\n\n\t\t<button class=\"one-novanta-filter-dropdown__button wp-one-novanta-button wp-one-novanta-button--secondary\" aria-expanded=\"false\" type=\"button\">\n\t\t<span class=\"text\"><span class=\"one-novanta-filter-dropdown__selected\"><span class=\"has-medium-font-size one-novanta-filter-dropdown__selected-value-prefix\"><\/span><span class=\"has-medium-font-size one-novanta-filter-dropdown__selected-value\">Filter by Type<\/span><\/span><\/span>\n\t\t\t\t\t<span class=\"wp-one-novanta-button__icon\">\n\t\t\t\t<svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12\" height=\"8\" viewBox=\"0 0 12 8\" fill=\"none\"><path fill=\"currentColor\" d=\"M1.41.297 6 4.877l4.59-4.58L12 1.707l-6 6-6-6L1.41.297Z\" \/><\/svg>\t\t\t<\/span>\n\t\t\t<\/button>\n\t\n\t<ul class=\"one-novanta-filter-dropdown__dropdown-list is-hidden one-novanta-filter-dropdown__dropdown-list--left\" role=\"listbox\">\n\t\t<!-- Default option -->\n\t\t<li id=\"filter-option-0\" role=\"option\" class=\"selected wp-one-novanta-table__filter__option--default\">Filter by Type<\/li>\n\n\t\t<!-- Options from column. -->\n\t\t\t\t\t<li id=\"filter-option-1\" role=\"option\">Brochure<\/li>\n\t\t\t\t\t\t<li id=\"filter-option-2\" role=\"option\">Software<\/li>\n\t\t\t\t\t\t<li id=\"filter-option-3\" role=\"option\">User Manual<\/li>\n\t\t\t\t<\/ul>\n<\/div>\n\t<\/div>\n\n\t<figure data-is-loading=\"false\">\n\n\t\t<table class=\"wp-one-novanta-table__wrapper\">\n\n\t\t\t<thead class=\"wp-one-novanta-table__head\">\n\t\t\t\t<tr class=\"wp-one-novanta-table__head-row\">\n\t\t\t\t\t\t\t\t\t\t\t<th class=\"wp-one-novanta-table__head-cell wp-one-novanta-table__head-cell__background-mid-gray\">Download<\/th>\n\t\t\t\t\t\t\t\t\t\t\t<th class=\"wp-one-novanta-table__head-cell wp-one-novanta-table__head-cell__background-mid-gray\">Download Type<\/th>\n\t\t\t\t\t\t\t\t\t\t\t<th class=\"wp-one-novanta-table__head-cell wp-one-novanta-table__head-cell__background-mid-gray\">Language<\/th>\n\t\t\t\t\t\t\t\t\t<\/tr>\n\t\t\t<\/thead>\n\n\t\t\t<tbody class=\"wp-one-novanta-table__body\">\n\t\t\t\n<tr class=\"wp-one-novanta-table__body-row\">\n\t\t\t\t<td class=\"wp-one-novanta-table__body-cell\">\n\t\t\t\tPR-600 Series Visible Range Portable Spectroradiometers \t\t\t<\/td>\n\t\t\t\t\t\t\t<td class=\"wp-one-novanta-table__body-cell\">\n\t\t\t\tBrochure\t\t\t<\/td>\n\t\t\t\t\t\t\t<td class=\"wp-one-novanta-table__body-cell\">\n\t\t\t\t<a href=\"#\" role=\"button\" data-gate-id=\"6067\" data-form-id=\"2\" data-modal-id=\"gated_doc_2\" aria-label=\"Download document in English\">English<\/a>\t\t\t<\/td>\n\t\t\t\t<\/tr>\n\n<tr class=\"wp-one-novanta-table__body-row\">\n\t\t\t\t<td class=\"wp-one-novanta-table__body-cell\">\n\t\t\t\tPhoto Research Installer for USB Driver\t\t\t<\/td>\n\t\t\t\t\t\t\t<td class=\"wp-one-novanta-table__body-cell\">\n\t\t\t\tSoftware\t\t\t<\/td>\n\t\t\t\t\t\t\t<td class=\"wp-one-novanta-table__body-cell\">\n\t\t\t\t<a href=\"#\" role=\"button\" data-gate-id=\"1066\" data-form-id=\"2\" data-modal-id=\"gated_doc_2\" aria-label=\"Download document in English\">English<\/a>\t\t\t<\/td>\n\t\t\t\t<\/tr>\n\n<tr class=\"wp-one-novanta-table__body-row\">\n\t\t\t\t<td class=\"wp-one-novanta-table__body-cell\">\n\t\t\t\tSpectraWin\u2122 2 Software\t\t\t<\/td>\n\t\t\t\t\t\t\t<td class=\"wp-one-novanta-table__body-cell\">\n\t\t\t\tSoftware\t\t\t<\/td>\n\t\t\t\t\t\t\t<td class=\"wp-one-novanta-table__body-cell\">\n\t\t\t\t<a href=\"#\" role=\"button\" data-gate-id=\"1010\" data-form-id=\"2\" data-modal-id=\"gated_doc_2\" aria-label=\"Download document in English\">English<\/a>\t\t\t<\/td>\n\t\t\t\t<\/tr>\n\n<tr class=\"wp-one-novanta-table__body-row\">\n\t\t\t\t<td class=\"wp-one-novanta-table__body-cell\">\n\t\t\t\tSpectraWin 2 User Calibration Manual\t\t\t<\/td>\n\t\t\t\t\t\t\t<td class=\"wp-one-novanta-table__body-cell\">\n\t\t\t\tUser Manual\t\t\t<\/td>\n\t\t\t\t\t\t\t<td class=\"wp-one-novanta-table__body-cell\">\n\t\t\t\t<a href=\"#\" role=\"button\" data-gate-id=\"1002\" data-form-id=\"2\" data-modal-id=\"gated_doc_2\" aria-label=\"Download document in English\">English<\/a>\t\t\t<\/td>\n\t\t\t\t<\/tr>\n\n<tr class=\"wp-one-novanta-table__body-row\">\n\t\t\t\t<td class=\"wp-one-novanta-table__body-cell\">\n\t\t\t\tSpectraScan PR-655 \u2013 670 User Manual\t\t\t<\/td>\n\t\t\t\t\t\t\t<td class=\"wp-one-novanta-table__body-cell\">\n\t\t\t\tUser Manual\t\t\t<\/td>\n\t\t\t\t\t\t\t<td class=\"wp-one-novanta-table__body-cell\">\n\t\t\t\t<a href=\"#\" role=\"button\" data-gate-id=\"1060\" data-form-id=\"2\" data-modal-id=\"gated_doc_2\" aria-label=\"Download document in English\">English<\/a>\t\t\t<\/td>\n\t\t\t\t<\/tr>\n\n<tr class=\"wp-one-novanta-table__body-row\">\n\t\t\t\t<td class=\"wp-one-novanta-table__body-cell\">\n\t\t\t\tSpectraWin2 Software User Manual\t\t\t<\/td>\n\t\t\t\t\t\t\t<td class=\"wp-one-novanta-table__body-cell\">\n\t\t\t\tUser Manual\t\t\t<\/td>\n\t\t\t\t\t\t\t<td class=\"wp-one-novanta-table__body-cell\">\n\t\t\t\t<a href=\"#\" role=\"button\" data-gate-id=\"1003\" data-form-id=\"2\" data-modal-id=\"gated_doc_2\" aria-label=\"Download document in English\">English<\/a>\t\t\t<\/td>\n\t\t\t\t<\/tr>\n\t\t\t<\/tbody>\n\n\t\t<\/table>\n\n\t\t\n\t<div class=\"\n\t\twp-one-novanta-table__is-loading hidden\t\">\n\t\t<svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"32\" height=\"32\" viewBox=\"0 0 24 24\"><!-- Icon from SVG Spinners by Utkarsh Verma - https:\/\/github.com\/n3r4zzurr0\/svg-spinners\/blob\/main\/LICENSE --><path fill=\"currentColor\" d=\"M12,1A11,11,0,1,0,23,12,11,11,0,0,0,12,1Zm0,19a8,8,0,1,1,8-8A8,8,0,0,1,12,20Z\" opacity=\".25\" \/><path fill=\"currentColor\" d=\"M12,4a8,8,0,0,1,7.89,6.7A1.53,1.53,0,0,0,21.38,12h0a1.5,1.5,0,0,0,1.48-1.75,11,11,0,0,0-21.72,0A1.5,1.5,0,0,0,2.62,12h0a1.53,1.53,0,0,0,1.49-1.3A8,8,0,0,1,12,4Z\"><animateTransform attributeName=\"transform\" dur=\"0.75s\" repeatCount=\"indefinite\" type=\"rotate\" values=\"0 12 12;360 12 12\" \/><\/path><\/svg>\n\t<\/div>\n\n\t<\/figure>\n\n\t\n<\/div>\n\t\t\t\t<\/rt-tabs-tab>\n\n\t\t\t\n<\/rt-tabs>\n<\/div>\n<\/div>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>The <strong>Photo Research\u00ae SpectraScan\u00ae<\/strong><strong>\u00a0Spectroradiometer PR-655<\/strong> is an economical portable solution for spectral based photometric and colorimetric light measurements, designed for applications requiring precise light measurements from a range of light sources, such as display monitors and projectors, reflective surfaces, and industrial applications (visual display testing, LED testing, film and video post-production, auto\/aerospace displays, and dental color testing).<\/p>\n<p>A handheld, completely portable battery powered (Li-ion, USB charger)\u00a0 unit for stand alone operations, the PR-655 interfaces with USB, and optional Bluetooth\u00ae or RS-232, with a Secure Digital (SD) port to allow users to store measurement data on removable media.<\/p>\n<p>Configured with 128 detector elements, the PR-655 has a wide dynamic range of 0.2 fL to 30,000 fL (without external neutral density filters) and spectral resolution of 3.12 nm per pixel, and spectral range of 380\u2013780 nm, accompanied by an automated measure shutter.<\/p>\n<p>Available with standard 1\u00b0 aperture (optional 1\/2\u00b0), and 2 sensitivity modes (standard &amp; extended) with 4 measurements speeds: normal, fast, 2x fast, 4x fast.<\/p>\n<p>The unit displays a number of data and color spectra graphs of:<\/p>\n<ul>\n<li>Spectral based photometric and colorimetric measurements, performing white point calibrations of CRTs, LCDs, PDPs and digital projectors<\/li>\n<li>Source spectral power distribution<\/li>\n<li>Dominant wavelength<\/li>\n<li>Correlated color temperature<\/li>\n<\/ul>\n<p>Controls are easy with a state-of-the-art 2.25\u201d x 3\u201d full color high-resolution touch screen LCD display, and 5-way navigation keypad, plus programmable User Profiles for saving setup and preference settings. The\u00a0PR-655\u00a0requires no-PC, however with the SpectraWIN 2 software data stored from the unit on SD removable media can viewed and display. And in Remote Mode, ASCII based text commands from your PC or MAC can control the unit, as well as be used to create custom programming for automatic test equipment (ATE) environments.<\/p>\n<p>Additional features that maintain highest quality accuracy and control over light measurements include:<\/p>\n<ul>\n<li>AutoSync for automatically synchronizing to display backlight or source refresh rate for superior accuracy<\/li>\n<li>External trigger port for remote activation, push button activation for peripheral devices<\/li>\n<\/ul>\n<p>The PR-655 offers a wide range of accessory options to extend functionality. The following examples illustrate the breadth of capabilities:\u00a0<\/p>\n<ul>\n<li><strong>Radiance and Luminance Accessories:<\/strong> Attach a fiber probe for remote non-line-of-sight luminance testing.<\/li>\n<li><strong>Radiant and Luminous Flux Accessories:<\/strong> Use the LR-127 analyzer for testing LEDs to CIE 127.<\/li>\n<li><strong>Radiant and Luminous Intensity Accessories:<\/strong> Neutral density source attenuation filters are available.<\/li>\n<li><strong>Irradiance and Illuminance Accessories:<\/strong> Attach a Cosine Receptor that will measure irradiance or illuminance.<\/li>\n<li><strong>Reflectance Accessories:<\/strong> RGB Display Caloption provides an interactive method for white point calibration based on spectral measurements.<\/li>\n<\/ul>\n","protected":false},"featured_media":546,"template":"","meta":{"_acf_changed":false,"is_product_deprecated":false,"new_product_name":"","new_product_url":"","override_cta_button":true,"cta_button_text":"Download Datasheet","cta_target":"tab-documents-downloads-2","cta_button_link_type":"anchor","cta_button_url":"","footnotes":""},"product_type":[2],"product_cat":[74],"product_tag":[180,174,184,185,172,176,179,173,181,187,178,171,188,175,182,169,177,183,189,190,186,170],"class_list":{"0":"post-1736","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-spectroradiometer","8":"first","9":"instock","10":"shipping-taxable","11":"purchasable","12":"product-type-simple"},"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.0 (Yoast SEO v27.4) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Photo Research\u00ae SpectraScan\u00ae PR-655 - Precision Medicine<\/title>\n<meta name=\"description\" content=\"Photo Research PR-655 spectroradiometer for precise light and color measurement. 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