{"id":5917,"date":"2026-05-05T13:44:37","date_gmt":"2026-05-05T13:44:37","guid":{"rendered":"https:\/\/honeytek.com\/?p=5917"},"modified":"2026-05-16T10:15:30","modified_gmt":"2026-05-16T10:15:30","slug":"cat-iii-ou-cat-iv-quel-niveau-de-securite-pour-votre-multimetre","status":"publish","type":"post","link":"https:\/\/honeytek.com\/fr\/cat-iii-vs-cat-iv-what-multimeter-safety-rating-do-you-need\/","title":{"rendered":"CAT III ou CAT IV : quel niveau de s\u00e9curit\u00e9 devez-vous choisir pour votre multim\u00e8tre ?"},"content":{"rendered":"<div class=\"product\"><div class=\"product\">\n<p class=\"wp-block-paragraph\">Lors du choix d'un <strong><a href=\"https:\/\/honeytek.com\/fr\/digital-multimeter-dmm-manufacturer\/\" data-type=\"link\" data-id=\"https:\/\/honeytek.com\/digital-multimeter-dmm-manufacturer\/\">multim\u00e8tre num\u00e9rique<\/a><\/strong>, la compr\u00e9hension <strong>Classifications de s\u00e9curit\u00e9 CAT III et CAT IV<\/strong> est essentiel. Ces cat\u00e9gories d\u00e9terminent la capacit\u00e9 d'un compteur \u00e0 r\u00e9sister \u00e0 <strong>pointes de tension (transitoires)<\/strong> dans diff\u00e9rents environnements \u00e9lectriques.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Si vous choisissez un <strong>multim\u00e8tre destin\u00e9 aux \u00e9lectriciens, \u00e0 la maintenance industrielle ou \u00e0 la distribution<\/strong>, ce guide vous explique la v\u00e9ritable diff\u00e9rence \u2014 et comment faire le bon choix.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Lorsqu'on intervient sur des installations \u00e9lectriques, tous les outils de mesure n'offrent pas le m\u00eame niveau de protection. Les indices CAT (cat\u00e9gorie) sont des classifications de s\u00e9curit\u00e9 d\u00e9finies par les normes CEI qui indiquent la capacit\u00e9 d'un outil \u00e0 r\u00e9sister \u00e0 des transitoires de tension dans diff\u00e9rents environnements. Choisir la classification CAT adapt\u00e9e garantit que votre \u00e9quipement de test est capable de supporter les niveaux d'\u00e9nergie pr\u00e9sents dans la partie sp\u00e9cifique du syst\u00e8me \u00e9lectrique sur laquelle vous travaillez, assurant ainsi votre protection et celle de votre mat\u00e9riel.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>CAT I : Circuits \u00e0 faible consommation \u2013 \u00e9lectronique, signaux de commande<\/li>\n\n\n\n<li>CAT II : Prises standard \u2013 appareils \u00e9lectrom\u00e9nagers, outils portatifs<\/li>\n\n\n\n<li>CAT III : Niveau de distribution \u2013 disjoncteurs, \u00e9quipements fixes<\/li>\n\n\n\n<li>CAT IV : niveau des r\u00e9seaux publics \u2013 raccordements, lignes ext\u00e9rieures<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large is-resized\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1024\" height=\"1024\" src=\"https:\/\/honeytek.com\/wp-content\/uploads\/2025\/08\/HK888A-6000-Count-TRMS-2000V2000A-AC-Clamp-Meter-02-1024x1024.webp\" alt=\"\" class=\"wp-image-5872\" style=\"width:621px;height:auto\" srcset=\"https:\/\/honeytek.com\/wp-content\/uploads\/2025\/08\/HK888A-6000-Count-TRMS-2000V2000A-AC-Clamp-Meter-02-1024x1024.webp 1024w, https:\/\/honeytek.com\/wp-content\/uploads\/2025\/08\/HK888A-6000-Count-TRMS-2000V2000A-AC-Clamp-Meter-02-300x300.webp 300w, https:\/\/honeytek.com\/wp-content\/uploads\/2025\/08\/HK888A-6000-Count-TRMS-2000V2000A-AC-Clamp-Meter-02-150x150.webp 150w, https:\/\/honeytek.com\/wp-content\/uploads\/2025\/08\/HK888A-6000-Count-TRMS-2000V2000A-AC-Clamp-Meter-02-768x768.webp 768w, https:\/\/honeytek.com\/wp-content\/uploads\/2025\/08\/HK888A-6000-Count-TRMS-2000V2000A-AC-Clamp-Meter-02-600x600.webp 600w, https:\/\/honeytek.com\/wp-content\/uploads\/2025\/08\/HK888A-6000-Count-TRMS-2000V2000A-AC-Clamp-Meter-02-800x800.webp 800w, https:\/\/honeytek.com\/wp-content\/uploads\/2025\/08\/HK888A-6000-Count-TRMS-2000V2000A-AC-Clamp-Meter-02-100x100.webp 100w, https:\/\/honeytek.com\/wp-content\/uploads\/2025\/08\/HK888A-6000-Count-TRMS-2000V2000A-AC-Clamp-Meter-02.webp 1280w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Que signifient les notes CAT ?<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Classifications CAT (cat\u00e9gorie)<\/strong> sont d\u00e9finies par des normes de s\u00e9curit\u00e9 telles que celles de la Commission \u00e9lectrotechnique internationale (CEI 61010).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ils indiquent combien <strong>surtension transitoire<\/strong> qu'un multim\u00e8tre peut supporter en toute s\u00e9curit\u00e9.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udc49 Plus le score au CAT est \u00e9lev\u00e9, plus <strong>un environnement \u00e0 haut risque<\/strong> \u00e0 laquelle il est destin\u00e9.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><img decoding=\"async\" width=\"1024\" height=\"683\" src=\"https:\/\/honeytek.com\/wp-content\/uploads\/2026\/05\/What-Are-CAT-Safety-Ratings-for-Multimeters-Clamp-Meters-01.jpg\" alt=\"\" class=\"wp-image-5942\" srcset=\"https:\/\/honeytek.com\/wp-content\/uploads\/2026\/05\/What-Are-CAT-Safety-Ratings-for-Multimeters-Clamp-Meters-01.jpg 1024w, https:\/\/honeytek.com\/wp-content\/uploads\/2026\/05\/What-Are-CAT-Safety-Ratings-for-Multimeters-Clamp-Meters-01-300x200.jpg 300w, https:\/\/honeytek.com\/wp-content\/uploads\/2026\/05\/What-Are-CAT-Safety-Ratings-for-Multimeters-Clamp-Meters-01-768x512.jpg 768w, https:\/\/honeytek.com\/wp-content\/uploads\/2026\/05\/What-Are-CAT-Safety-Ratings-for-Multimeters-Clamp-Meters-01-800x534.jpg 800w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>CAT III vs CAT IV : principales diff\u00e9rences<\/strong><\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Cat\u00e9gorie<\/th><th>Application type<\/th><th>Niveau de risque<\/th><th>Exemples<\/th><\/tr><\/thead><tbody><tr><td><strong>CAT III<\/strong><\/td><td>Circuits de distribution<\/td><td>Moyen \u00e0 \u00e9lev\u00e9<\/td><td>Tableaux de distribution, c\u00e2blage des b\u00e2timents, moteurs<\/td><\/tr><tr><td><strong>CAT IV<\/strong><\/td><td>Source de l'installation<\/td><td>Tr\u00e8s \u00e9lev\u00e9<\/td><td>R\u00e9seaux de services publics, c\u00e2bles ext\u00e9rieurs, points d'entr\u00e9e des services<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>\u00c0 quoi sert le CAT III ?<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A <strong>Multim\u00e8tre de cat\u00e9gorie III<\/strong> est con\u00e7u pour <strong>r\u00e9seaux \u00e9lectriques de distribution<\/strong>, notamment :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Tableaux \u00e9lectriques et tableaux de distribution<\/li>\n\n\n\n<li>Syst\u00e8mes de c\u00e2blage des b\u00e2timents<\/li>\n\n\n\n<li>\u00c9quipements industriels et moteurs<\/li>\n\n\n\n<li>Syst\u00e8mes de chauffage, de ventilation et de climatisation<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udc49 Voici le <strong>note la plus courante pour les \u00e9lectriciens et les travaux d'entretien<\/strong>.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>\u00c0 quoi sert le CAT IV ?<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A <strong>Multim\u00e8tre de cat\u00e9gorie IV<\/strong> est n\u00e9cessaire pour <strong>environnements \u00e0 haute \u00e9nergie<\/strong>, par exemple :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Entr\u00e9es des r\u00e9seaux de services publics<\/li>\n\n\n\n<li>Lignes \u00e9lectriques a\u00e9riennes<\/li>\n\n\n\n<li>Dispositifs de protection primaire contre les surintensit\u00e9s<\/li>\n\n\n\n<li>Raccordements \u00ab du compteur au r\u00e9seau \u00bb<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udc49 Ces environnements pr\u00e9sentent <strong>pics transitoires extr\u00eames<\/strong>, ce qui n\u00e9cessite une protection renforc\u00e9e.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>CAT III ou CAT IV : lequel vous convient le mieux ?<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Choisissez <strong>CAT III<\/strong> si vous travaillez avec :<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Tableaux \u00e9lectriques<\/li>\n\n\n\n<li>Installations techniques des b\u00e2timents<\/li>\n\n\n\n<li>Entretien du mat\u00e9riel<\/li>\n\n\n\n<li>Syst\u00e8mes de chauffage, de ventilation et de climatisation<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u2714 Exemple : A <strong>Multim\u00e8tre num\u00e9rique CAT III 600 V<\/strong> Cela suffit \u00e0 la plupart des \u00e9lectriciens.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Choisissez <strong>CAT IV<\/strong> si vous travaillez avec :<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Installations \u00e9lectriques ext\u00e9rieures<\/li>\n\n\n\n<li>Connexions au niveau des services publics<\/li>\n\n\n\n<li>Distribution d'\u00e9lectricit\u00e9 \u00e0 partir du r\u00e9seau<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u2714 Obligatoire pour <strong>environnements d'essais \u00e0 haut risque et \u00e0 haute \u00e9nergie<\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Pourquoi les cotes CAT sont-elles importantes (du point de vue de la s\u00e9curit\u00e9) ?<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Les installations \u00e9lectriques peuvent produire <strong>des pics de tension sup\u00e9rieurs de plusieurs milliers de volts \u00e0 la tension nominale<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Un multim\u00e8tre ne disposant pas d'un indice CAT appropri\u00e9 peut :<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u274c \u00c9chec en interne<br>\u274c Peut entra\u00eener des risques li\u00e9s aux arcs \u00e9lectriques<br>\u274c Exposer l'utilisateur \u00e0 un risque<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udc49 Choisir la bonne cat\u00e9gorie permet de s'assurer que <strong>s\u00e9curit\u00e9 des op\u00e9rateurs et fiabilit\u00e9 des \u00e9quipements<\/strong>.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Comment choisir le niveau CAT qui vous convient ?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Pour choisir la cat\u00e9gorie CAT adapt\u00e9e, il est essentiel de bien comprendre votre environnement de travail. Les syst\u00e8mes \u00e9lectriques pr\u00e9sentent des variations importantes quant au niveau d\u2019\u00e9nergie transitoire qu\u2019ils peuvent produire. L\u2019utilisation d\u2019un outil dont la cat\u00e9gorie est trop faible pour l\u2019application vous expose \u00e0 un risque de dommages graves, voire pire. Utilisez la liste de contr\u00f4le ci-dessous pour vous aider \u00e0 identifier la cat\u00e9gorie de s\u00e9curit\u00e9 appropri\u00e9e : Quel type de syst\u00e8me mesurez-vous ? \u00c0 quelle distance vous trouvez-vous de la source d\u2019alimentation (r\u00e9seau public ou circuit interne) ? Quelle est la tension transitoire maximale \u00e0 laquelle vous pourriez \u00eatre confront\u00e9 ? En cas de doute, optez pour la cat\u00e9gorie la plus \u00e9lev\u00e9e. Les outils de cat\u00e9gorie CAT sup\u00e9rieure peuvent \u00eatre utilis\u00e9s dans des environnements de cat\u00e9gorie CAT inf\u00e9rieure, mais jamais l\u2019inverse.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>FAQ \u2013 Multim\u00e8tres CAT III et CAT IV<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>La cat\u00e9gorie CAT III 600 V est-elle suffisante pour les \u00e9lectriciens ?<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Oui. A <strong>Multim\u00e8tre CAT III 600 V<\/strong> convient \u00e0 la plupart des <strong>travaux d'\u00e9lectricit\u00e9 dans les locaux commerciaux et les logements<\/strong>, y compris les panneaux et les syst\u00e8mes de c\u00e2blage.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>La cat\u00e9gorie IV est-elle plus s\u00fbre que la cat\u00e9gorie III ?<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Oui. <strong>CAT IV<\/strong> offre une meilleure protection contre <strong>transitoires de tension extr\u00eames<\/strong>, notamment dans les environnements ext\u00e9rieurs ou les locaux techniques.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Puis-je utiliser un testeur de cat\u00e9gorie III dans des environnements de cat\u00e9gorie IV ?<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Non. Un compteur de cat\u00e9gorie III est <strong>n'est pas con\u00e7u pour supporter des pics d'\u00e9nergie \u00e9lev\u00e9s<\/strong> pr\u00e9sentes dans les environnements de cat\u00e9gorie IV.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Que se passe-t-il si j'utilise un indice CAT erron\u00e9 ?<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">L'utilisation d'un compteur de puissance nominale inf\u00e9rieure peut entra\u00eener <strong>panne d'\u00e9quipement ou risques graves pour la s\u00e9curit\u00e9<\/strong>, notamment dans les circuits \u00e0 haute \u00e9nergie.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Conclusion<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Compr\u00e9hension <strong>Caract\u00e9ristiques techniques des multim\u00e8tres CAT III et CAT IV<\/strong> est essentiel pour choisir le bon outil.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>CAT III<\/strong> \u2192 id\u00e9al pour la plupart des \u00e9lectriciens et des techniciens de maintenance<\/li>\n\n\n\n<li><strong>CAT IV<\/strong> \u2192 indispensable pour les environnements de services publics et \u00e0 haut risque<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"> Pour la plupart des applications, un <strong>Le multim\u00e8tre de cat\u00e9gorie III offre le meilleur compromis entre s\u00e9curit\u00e9 et co\u00fbt<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Outils courants class\u00e9s par indice CAT<\/strong><\/p>\n\n\n\n<div class=\"wp-block-columns has-ast-global-color-4-background-color has-background is-layout-flex wp-container-core-columns-is-layout-7387b849 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-full\"><a href=\"https:\/\/honeytek.com\/fr\/product\/hk78a-pro-4000-counts-trms-manual-cat-iii-1000v-ncv-digital-multimeter\/\"><img decoding=\"async\" width=\"800\" height=\"800\" src=\"https:\/\/honeytek.com\/wp-content\/uploads\/2025\/08\/HK78A-pro.png\" alt=\"\" class=\"wp-image-3498\" srcset=\"https:\/\/honeytek.com\/wp-content\/uploads\/2025\/08\/HK78A-pro.png 800w, https:\/\/honeytek.com\/wp-content\/uploads\/2025\/08\/HK78A-pro-300x300.png 300w, https:\/\/honeytek.com\/wp-content\/uploads\/2025\/08\/HK78A-pro-150x150.png 150w, https:\/\/honeytek.com\/wp-content\/uploads\/2025\/08\/HK78A-pro-768x768.png 768w, https:\/\/honeytek.com\/wp-content\/uploads\/2025\/08\/HK78A-pro-600x600.png 600w, https:\/\/honeytek.com\/wp-content\/uploads\/2025\/08\/HK78A-pro-100x100.png 100w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/a><\/figure>\n\n\n\n<h3 class=\"wp-block-heading has-text-align-center\">CATIII<\/h3>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-full\"><a href=\"https:\/\/honeytek.com\/fr\/product\/hk68b-5999-counts-true-rms-auto-range-digital-multimeter\/\"><img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"800\" src=\"https:\/\/honeytek.com\/wp-content\/uploads\/2025\/08\/HK68C-Digital-Multimeter-1-1.png\" alt=\"\" class=\"wp-image-4164\" srcset=\"https:\/\/honeytek.com\/wp-content\/uploads\/2025\/08\/HK68C-Digital-Multimeter-1-1.png 800w, https:\/\/honeytek.com\/wp-content\/uploads\/2025\/08\/HK68C-Digital-Multimeter-1-1-300x300.png 300w, https:\/\/honeytek.com\/wp-content\/uploads\/2025\/08\/HK68C-Digital-Multimeter-1-1-150x150.png 150w, https:\/\/honeytek.com\/wp-content\/uploads\/2025\/08\/HK68C-Digital-Multimeter-1-1-768x768.png 768w, https:\/\/honeytek.com\/wp-content\/uploads\/2025\/08\/HK68C-Digital-Multimeter-1-1-600x600.png 600w, https:\/\/honeytek.com\/wp-content\/uploads\/2025\/08\/HK68C-Digital-Multimeter-1-1-100x100.png 100w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/a><\/figure>\n\n\n\n<h3 class=\"wp-block-heading has-text-align-center\">CATIII<\/h3>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-full\"><a href=\"https:\/\/honeytek.com\/fr\/product\/hk78bt-6000-counts-trms-auto-range-digital-multimeter-with-bluetooth\/\"><img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"800\" src=\"https:\/\/honeytek.com\/wp-content\/uploads\/2025\/08\/HK78BT-1.png\" alt=\"\" class=\"wp-image-3501\" srcset=\"https:\/\/honeytek.com\/wp-content\/uploads\/2025\/08\/HK78BT-1.png 800w, https:\/\/honeytek.com\/wp-content\/uploads\/2025\/08\/HK78BT-1-300x300.png 300w, https:\/\/honeytek.com\/wp-content\/uploads\/2025\/08\/HK78BT-1-150x150.png 150w, https:\/\/honeytek.com\/wp-content\/uploads\/2025\/08\/HK78BT-1-768x768.png 768w, https:\/\/honeytek.com\/wp-content\/uploads\/2025\/08\/HK78BT-1-600x600.png 600w, https:\/\/honeytek.com\/wp-content\/uploads\/2025\/08\/HK78BT-1-100x100.png 100w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/a><\/figure>\n\n\n\n<h3 class=\"wp-block-heading has-text-align-center\"><a href=\"https:\/\/honeytek.com\/fr\/product\/hk78bt-6000-counts-trms-auto-range-digital-multimeter-with-bluetooth\/\">CATIV<\/a><\/h3>\n<\/div>\n<\/div>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n<\/div><\/div>","protected":false},"excerpt":{"rendered":"<p>When choosing a digital multimeter, understanding CAT III vs CAT IV safety ratings is critical. 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