{"product_id":"topdon-ct100-circuittester","title":"Topdon CT100 | Circuit tester","description":"\u003cdiv style=\"font-family:sans-serif; line-height:1.6; color:#374151; font-size:15px;\"\u003e\n\u003cp\u003eThe \u003cstrong\u003eTopdon CT100\u003c\/strong\u003e is an \u003cstrong\u003eautomotive circuit tester\u003c\/strong\u003e for diagnosing electrical problems in vehicles. The device features a \u003cstrong\u003ebright digital display with backlighting\u003c\/strong\u003e that shows DC voltage within a range of \u003cstrong\u003e3.3 to 65 V\u003c\/strong\u003e, with a resolution of 0.1 V. Additionally, the tester performs a \u003cstrong\u003eprofessional load measurement\u003c\/strong\u003e up to 1.2 A, checking battery load and circuit load to detect aged batteries, weak connections, and voltage drops. Thanks to the wide measurement range, the tester is suitable for \u003cstrong\u003e12V, 24V, and 36V systems\u003c\/strong\u003e in cars, trucks, and campers.\u003c\/p\u003e\n\u003cp\u003eWhen contacting a circuit, the tester immediately shows the \u003cstrong\u003epolarity\u003c\/strong\u003e via two-color backlighting: red for positive and green for negative, supported by ± indicators on the screen. The \u003cstrong\u003eextended 3.8-meter (12.5-foot) test cable\u003c\/strong\u003e reaches hard-to-access places without moving the tester. Through the \u003cstrong\u003euniversal 4mm banana plug connections\u003c\/strong\u003e, interchangeable probes and clamps can be used. The tester works without a battery thanks to power from the circuit being tested, with built-in protection against \u003cstrong\u003eovervoltage, overheating, and reverse polarity\u003c\/strong\u003e to protect sensitive vehicle electronics.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv style=\"display:flex; flex-wrap:wrap; gap:20px; margin:30px 0; align-items:stretch;\"\u003e\n\u003cdiv style=\"flex:1; min-width:250px; background:#ffffff; border:1px solid #e5e7eb; border-radius:8px; padding:20px;\"\u003e\n\u003ch3 style=\"color:#166534; text-transform:uppercase; font-size:13px; font-weight:800; border-bottom:2px solid #22c55e; padding-bottom:10px; margin-top:0;\"\u003e\nADVANTAGES\n\u003c\/h3\u003e\n\u003cdiv style=\"display:flex; align-items:flex-start; margin-bottom:12px;\"\u003e\n\u003cspan style=\"color:#16a34a; font-weight:900; margin-right:10px; font-size:16px;\"\u003e✔\u003c\/span\u003e\n\u003cspan style=\"font-size:14px; color:#4b5563; line-height:1.6;\"\u003e\n\u003cstrong\u003eLoad measurement up to 1.2 A\u003c\/strong\u003e identifies weak connections that go unnoticed with a simple test light.\n\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"display:flex; align-items:flex-start; margin-bottom:12px;\"\u003e\n\u003cspan style=\"color:#16a34a; font-weight:900; margin-right:10px; font-size:16px;\"\u003e✔\u003c\/span\u003e\n\u003cspan style=\"font-size:14px; color:#4b5563; line-height:1.6;\"\u003e\n\u003cstrong\u003eInterchangeable probes via 4mm banana plugs\u003c\/strong\u003e allow adaptation to different measurement situations without extra tools.\n\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"display:flex; align-items:flex-start; margin-bottom:12px;\"\u003e\n\u003cspan style=\"color:#16a34a; font-weight:900; margin-right:10px; font-size:16px;\"\u003e✔\u003c\/span\u003e\n\u003cspan style=\"font-size:14px; color:#4b5563; line-height:1.6;\"\u003e\n\u003cstrong\u003eTwo-color polarity indication\u003c\/strong\u003e prevents reversed connections on sensitive vehicle electronics.\n\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"display:flex; align-items:flex-start; margin-bottom:12px;\"\u003e\n\u003cspan style=\"color:#16a34a; font-weight:900; margin-right:10px; font-size:16px;\"\u003e✔\u003c\/span\u003e\n\u003cspan style=\"font-size:14px; color:#4b5563; line-height:1.6;\"\u003e\n\u003cstrong\u003eWorks without internal battery\u003c\/strong\u003e, so no maintenance or downtime due to dead batteries during diagnostic sessions.\n\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex:1; min-width:250px; background:#ffffff; border:1px solid #e5e7eb; border-radius:8px; padding:20px;\"\u003e\n\u003ch3 style=\"color:#991b1b; text-transform:uppercase; font-size:13px; font-weight:800; border-bottom:2px solid #ef4444; padding-bottom:10px; margin-top:0;\"\u003e\nHIGHLIGHTS\n\u003c\/h3\u003e\n\u003cdiv style=\"display:flex; align-items:flex-start; margin-bottom:12px;\"\u003e\n\u003cspan style=\"color:#dc2626; font-weight:900; margin-right:10px; font-size:16px;\"\u003e✕\u003c\/span\u003e\n\u003cspan style=\"font-size:14px; color:#4b5563; line-height:1.6;\"\u003e\nThe \u003cstrong\u003eload measurement\u003c\/strong\u003e requires holding the button for 5 seconds, which can be inconvenient for prolonged measurements.\n\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"display:flex; align-items:flex-start; margin-bottom:12px;\"\u003e\n\u003cspan style=\"color:#dc2626; font-weight:900; margin-right:10px; font-size:16px;\"\u003e✕\u003c\/span\u003e\n\u003cspan style=\"font-size:14px; color:#4b5563; line-height:1.6;\"\u003e\nThe measurement range up to \u003cstrong\u003e65 V DC\u003c\/strong\u003e is suitable for low-voltage systems; high-voltage hybrid and EV systems are outside the scope.\n\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003chr style=\"border:0; border-top:1px solid #e5e7eb; margin:40px 0;\"\u003e\n\u003ch2 style=\"border-left:5px solid #006aff; padding-left:15px; font-weight:800;\"\u003eApplications and functionalities\u003c\/h2\u003e\n\u003cp\u003eThe CT100 supports the following electrical test functions:\u003c\/p\u003e\n\u003cul style=\"padding-left:20px;\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eDC voltage measurement:\u003c\/strong\u003e Measures DC voltage from 3.3 to 65 V with 0.1 V resolution for checking batteries, sensors, and power supplies.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLoad test:\u003c\/strong\u003e Draws up to 1.2 A from the circuit to assess actual load capacity and reveal weak points.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePolarity check:\u003c\/strong\u003e Shows immediately via red or green backlighting whether a connection is positive or negative.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFuse test:\u003c\/strong\u003e Checks continuity and voltage on fuses without removing them from the fuse box.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWiring diagnosis:\u003c\/strong\u003e Traces breaks, shorts, and voltage drops in vehicle wiring.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnector check:\u003c\/strong\u003e Verifies voltage on connectors and plugs when troubleshooting starting issues or intermittent faults.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr style=\"border:0; border-top:1px solid #e5e7eb; margin:40px 0;\"\u003e\n\u003ch2 style=\"border-left:5px solid #006aff; padding-left:15px; font-weight:800;\"\u003ePackage Contents\u003c\/h2\u003e\n\u003cul style=\"padding-left:20px;\"\u003e\n\u003cli\u003e\n\u003cstrong\u003e1x\u003c\/strong\u003e Topdon CT100 Circuit Tester\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1x\u003c\/strong\u003e 2mm probe\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1x\u003c\/strong\u003e Crocodile clip\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1x\u003c\/strong\u003e Adapter\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1x\u003c\/strong\u003e Storage bag\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1x\u003c\/strong\u003e Quick start guide\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cdiv style=\"background:#fff7ed; border-left:4px solid #f97316; padding:15px; margin:25px 0; font-size:14px; color:#9a3412; border-radius:0 6px 6px 0; display:flex; align-items:flex-start;\"\u003e\n\u003cspan style=\"font-size:20px; margin-right:12px;\"\u003e💡\u003c\/span\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eGood to know:\u003c\/strong\u003e Preferably connect the crocodile clip to a clean, bare ground directly on the chassis. Connecting to a dirty or painted contact point can affect voltage measurement and lead to inaccurate results during the load test.\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003chr style=\"border:0; border-top:1px solid #e5e7eb; margin:40px 0;\"\u003e\n\u003ch2 style=\"border-left:5px solid #006aff; padding-left:15px; font-weight:800;\"\u003e\nTechnical specifications\n\u003c\/h2\u003e\n\n\u003cstyle\u003e\ntable.specs-table {\n  width:100%;\n  border-collapse:collapse;\n}\n\ntable.specs-table th,\ntable.specs-table td {\n  border:1px solid #ccc;\n  padding:10px;\n  text-align:left;\n  vertical-align:top;\n}\n\ntable.specs-table th {\n  background-color:#f8f8f8;\n  font-weight:bold;\n  width:25%;\n  white-space:nowrap;\n}\n\u003c\/style\u003e\n\n\u003ctable class=\"specs-table\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eDescription\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eProduct brand\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eTopdon\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eProduct model\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCT100\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eVoltage measurement range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDC 3.3 V to 65 V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eLoad measurement\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e5 V to 30 V (Max. 1.2 A)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMeasurement accuracy\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e3.3 V to 60 V: ±0.1 V \/ 60 V to 65 V: ±0.2 V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMeasurement resolution\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e0.1 V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCable length\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e3.8 m (12.5 ft)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eProbe connection\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e4 mm banana plug\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOperating temperature\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e-10 °C to 50 °C (14 °F to 122 °F)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eStorage temperature\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e-20 °C to 70 °C (-4 °F to 158 °F)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"Topdon","offers":[{"title":"Default Title","offer_id":53396915749171,"sku":"CT100","price":52.95,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0912\/5874\/9235\/files\/Topdon-CT100-Circuittester.webp?v=1780309965","url":"https:\/\/www.astools.eu\/products\/topdon-ct100-circuit-tester","provider":"AsTools","version":"1.0","type":"link"}