{"id":11948,"date":"2026-09-30T10:39:52","date_gmt":"2026-09-30T10:39:52","guid":{"rendered":"https:\/\/shop.autoboss.com\/?post_type=product&#038;p=11948"},"modified":"2026-10-09T08:20:30","modified_gmt":"2026-10-09T08:20:30","slug":"mrcartool-b550-automotive-circuit-tester-with-led-display","status":"publish","type":"product","link":"https:\/\/autoboss.com\/es\/product\/mrcartool-b550-automotive-circuit-tester-with-led-display\/","title":{"rendered":"MRCARTOOL B550 9-30V Automotive Circuit Tester with Scope Mode &#038; Component Activation"},"content":{"rendered":"<div class=\"abd-pd\" data-abd-version=\"1\">\n<header class=\"abd-hero\">\n<h3>Measure, Scope and Activate Circuits in 9\u201330 V Electrical Systems<\/h3>\n<p class=\"abd-lead\">The B550 combines a multimeter mode, an oscilloscope mode, frequency testing, an adjustable 0\u20135 V output and component activation in one probe-style circuit tester for 9 V to 30 V systems, with current overload protection.<\/p>\n<ul class=\"abd-facts\">\n<li>Multimeter + Scope Modes<\/li>\n<li>Component Activation<\/li>\n<li>0\u20135 V Adjustable Output<\/li>\n<li>Frequency Test<\/li>\n<li>Built-In Flashlight<\/li>\n<\/ul>\n<\/header>\n<section class=\"abd-sec\" id=\"abd-features\">\n<h4>Key Features<\/h4>\n<ol class=\"abd-features\">\n<li>\n<h5>Multimeter Mode<\/h5>\n<p>DC voltage with maximum and minimum readings, plus resistance and diode tests to find components damaged by short circuits.<\/p>\n<\/li>\n<li>\n<h5>Oscilloscope Mode<\/h5>\n<p>Displays the voltage, frequency and duty cycle of the tested component as a curve.<\/p>\n<\/li>\n<li>\n<h5>Component Activation<\/h5>\n<p>Outputs the drive waveform needed to activate components such as lights, motors and other onboard electronic devices.<\/p>\n<\/li>\n<li>\n<h5>Adjustable 0\u20135 V Output<\/h5>\n<p>Set any output voltage between 0 and 5 V to check the wiring of the component under test; the tool alarms if the output differs from the set value by more than 0.1 V.<\/p>\n<\/li>\n<li>\n<h5>Flashlight Design<\/h5>\n<p>Lights the test point so you can complete circuit testing in dark areas.<\/p>\n<\/li>\n<li>\n<h5>Wide Application<\/h5>\n<p>Diagnoses circuit issues on cars, trucks, SUVs, motorcycles, boats, excavators and trailers.<\/p>\n<\/li>\n<\/ol>\n<\/section>\n<section class=\"abd-sec abd-hls\" id=\"abd-highlights\">\n<h4>Highlights<\/h4>\n<figure class=\"abd-hl\"><img decoding=\"async\" src=\"https:\/\/autoboss.com\/wp-content\/uploads\/mrcartool-catalog\/media\/904707c43ed409925d2a28a4.jpg\" alt=\"MRCARTOOL B550 multimeter screens for DC voltage, resistance and diode tests\" width=\"1200\" height=\"1200\" loading=\"lazy\"><figcaption>\n<h5>Multimeter Screens<\/h5>\n<p>Voltage with min\/max, resistance and diode\/continuity readings.<\/p>\n<\/figcaption><\/figure>\n<figure class=\"abd-hl\"><img decoding=\"async\" src=\"https:\/\/autoboss.com\/wp-content\/uploads\/mrcartool-catalog\/media\/f9b06174d52347dbce7fca11.jpg\" alt=\"MRCARTOOL B550 oscilloscope mode showing a square-wave signal\" width=\"1200\" height=\"1200\" loading=\"lazy\"><figcaption>\n<h5>Scope Mode<\/h5>\n<p>See the signal waveform along with its frequency and duty cycle.<\/p>\n<\/figcaption><\/figure>\n<figure class=\"abd-hl\"><img decoding=\"async\" src=\"https:\/\/autoboss.com\/wp-content\/uploads\/mrcartool-catalog\/media\/2ee0482132f1eaea80dfdec4.jpg\" alt=\"MRCARTOOL B550 activating a headlamp bulb in component activation mode\" width=\"1200\" height=\"1200\" loading=\"lazy\"><figcaption>\n<h5>Activate a Component<\/h5>\n<p>Drive a bulb or motor directly to confirm it works.<\/p>\n<\/figcaption><\/figure>\n<\/section>\n<section class=\"abd-sec\" id=\"abd-compare\">\n<h4>B550 vs B530<\/h4>\n<div class=\"abd-table-wrap\">\n<table class=\"abd-table abd-compare\">\n<thead>\n<tr>\n<th scope=\"col\"><\/th>\n<th scope=\"col\" class=\"is-current\">B550<\/th>\n<th scope=\"col\">B530<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<th scope=\"row\">Multimeter mode<\/th>\n<td class=\"is-current\">Yes<\/td>\n<td>No<\/td>\n<\/tr>\n<tr>\n<th scope=\"row\">Frequency test<\/th>\n<td class=\"is-current\">Yes<\/td>\n<td>No<\/td>\n<\/tr>\n<tr>\n<th scope=\"row\">Oscilloscope mode<\/th>\n<td class=\"is-current\">Yes<\/td>\n<td>No<\/td>\n<\/tr>\n<tr>\n<th scope=\"row\">0\u20135 V power supply<\/th>\n<td class=\"is-current\">Yes<\/td>\n<td>No<\/td>\n<\/tr>\n<tr>\n<th scope=\"row\">Battery support<\/th>\n<td class=\"is-current\">12 V \/ 24 V<\/td>\n<td>12 V \/ 24 V<\/td>\n<\/tr>\n<tr>\n<th scope=\"row\">Extension cable<\/th>\n<td class=\"is-current\">10 m<\/td>\n<td>10 m<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/section>\n<section class=\"abd-sec\" id=\"abd-box\">\n<h4>What&#8217;s in the Box<\/h4>\n<ul class=\"abd-box\">\n<li>B550 main unit<\/li>\n<li>Battery hookup clips<\/li>\n<li>Extension cable<\/li>\n<li>Extension connection line<\/li>\n<li>Probe adapter<\/li>\n<li>Probe tip<\/li>\n<li>USB cable<\/li>\n<li>Storage bag<\/li>\n<li>User manual<\/li>\n<\/ul>\n<figure class=\"abd-fig\"><img decoding=\"async\" src=\"https:\/\/autoboss.com\/wp-content\/uploads\/mrcartool-catalog\/media\/7a0ef14bbcc82bf77c85184f.jpg\" alt=\"MRCARTOOL B550 main unit, storage bag, battery clips, extension cables, USB cable, probe adapter, probe tip and user manual\" width=\"1200\" height=\"1200\" loading=\"lazy\"><figcaption>B550 package contents.<\/figcaption><\/figure>\n<p class=\"abd-note\">Setup and operation: <a href=\"https:\/\/autoboss.com\/wp-content\/uploads\/mrcartool-catalog\/media\/ecb10f3fc70ac750a1f7aacc.pdf\" target=\"_blank\" rel=\"noopener\">B550 user manual (PDF)<\/a>.<\/p>\n<\/section>\n<section class=\"abd-sec\" id=\"abd-notes\">\n<h4>Good to Know<\/h4>\n<div class=\"abd-notes\">\n<div class=\"abd-note-group is-caution\">\n<h5><span class=\"abd-tag\">Caution<\/span><\/h5>\n<ul>\n<li>Keep clothing, hair, hands, tools and test equipment away from operating or hot equipment.<\/li>\n<li>Take special care near the ignition coil, distributor cap, ignition wires and spark plugs, which carry dangerously high voltage when the engine is running.<\/li>\n<li>Keep a fire extinguisher at hand when working with gasoline, chemicals or electrical equipment.<\/li>\n<li>Before testing, put the transmission in Park (automatic) or Neutral (manual) and set the handbrake.<\/li>\n<li>Do not connect or disconnect test equipment while the ignition is on or the engine is running.<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<\/section>\n<\/div>","protected":false},"excerpt":{"rendered":"<ul>\n<li><strong>Wide Range of Applications:\u00a0<\/strong>The MRCARTOOL B550 automotive circuit tester offers various practical working modes, supporting detection systems in diverse electrical models.<\/li>\n<li><strong>Component Activation Function:\u00a0<\/strong>The MRCARTOOL B550 automotive circuit tester outputs required drive waveforms for component activation.<\/li>\n<li><strong>Warranty:<\/strong> MRCARTOOL provides 24 months warranty and 7\u00d724 hours friendly customer service to ensure your shopping experience.<a href=\"https:\/\/api.whatsapp.com\/send\/?phone=%2B8618923768146&amp;text=onlinesupport\"><span style=\"color: #d83131\"><strong>Online Support&gt;&gt;<\/strong><\/span><\/a><\/li>\n<\/ul>","protected":false},"featured_media":12310,"comment_status":"open","ping_status":"closed","template":"","meta":{"_gspb_post_css":""},"product_brand":[126],"product_cat":[51],"product_tag":[],"class_list":["post-11948","product","type-product","status-publish","has-post-thumbnail","product_brand-mrcartool","product_cat-automotive-electronic-circuit-inspection","first","instock","sale","shipping-taxable","purchasable","product-type-variable"],"_links":{"self":[{"href":"https:\/\/autoboss.com\/es\/wp-json\/wp\/v2\/product\/11948","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/autoboss.com\/es\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/autoboss.com\/es\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/autoboss.com\/es\/wp-json\/wp\/v2\/comments?post=11948"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/autoboss.com\/es\/wp-json\/wp\/v2\/media\/12310"}],"wp:attachment":[{"href":"https:\/\/autoboss.com\/es\/wp-json\/wp\/v2\/media?parent=11948"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/autoboss.com\/es\/wp-json\/wp\/v2\/product_brand?post=11948"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/autoboss.com\/es\/wp-json\/wp\/v2\/product_cat?post=11948"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/autoboss.com\/es\/wp-json\/wp\/v2\/product_tag?post=11948"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}