{"product_id":"aermotor-em289-car-circuit-tester-dc-6-75v-led-voltage-test-pen","title":"Aermotor EM289 Car Circuit Tester DC 6-75V LED Voltage Test Pen","description":"\n\u003ch2\u003eAermotor EM289 Car Circuit Tester – DC 6-75V LED Digital Voltage Display\u003c\/h2\u003e\n\u003cp\u003eTake the guesswork out of automotive electrical diagnostics with the \u003cstrong\u003eAermotor EM289 Car Circuit Tester\u003c\/strong\u003e. Engineered for professional and DIY mechanics alike, this versatile test pen delivers real-time digital voltage readings, polarity detection, and circuit break\/short tracing — all in one compact, easy-to-use tool. Compatible with 6V, 12V, 24V, 48V, and 60V DC systems, it's ideal for cars, motorcycles, trucks, bulldozers, rollers, and other heavy equipment.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eMade in Mainland China.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWide Voltage Range:\u003c\/strong\u003e Supports DC 6–75V systems including 6V, 12V, 24V, 48V, and 60V — perfect for a broad range of vehicles and equipment.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eReal-Time Digital Voltage Display:\u003c\/strong\u003e LED screen shows live voltage readings instantly, so you always know exactly what you're working with.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eColor-Coded Polarity Indication:\u003c\/strong\u003e RED LED = Positive; GREEN LED = Negative — eliminating confusion during testing.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAudible Alert:\u003c\/strong\u003e Built-in buzzer sounds when voltage is detected, letting you work without constantly looking at the display.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOvervoltage Warning:\u003c\/strong\u003e Automatically warns you when voltage exceeds safe operating limits.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCircuit Break, Short \u0026amp; Trace Detection:\u003c\/strong\u003e Quickly identify disconnected wires, shorts, and trace hidden circuits in your vehicle's wiring harness.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eExtended Spring Lead (~13.12 in):\u003c\/strong\u003e Generous-length spring-style alligator clip lead gives you plenty of reach in tight engine bays.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eProbe Protective Cover:\u003c\/strong\u003e Keeps the sharp probe tip safely shielded during storage and transport.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCE \u0026amp; RoHS Certified:\u003c\/strong\u003e Meets international safety and environmental standards.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNo Batteries Required:\u003c\/strong\u003e Powered directly from the circuit under test — no battery installation needed.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow It Works\u003c\/h3\u003e\n\u003ch4\u003e1. Self-Check\u003c\/h4\u003e\n\u003cp\u003eBefore use, clamp the alligator clip to the positive terminal of a known battery and touch the probe to the negative terminal. The red LED will light up, the screen will display the battery voltage, and the buzzer will sound — confirming the tester is working correctly.\u003c\/p\u003e\n\n\u003ch4\u003e2. Polarity Test\u003c\/h4\u003e\n\u003cp\u003eClamp the alligator clip to a known battery terminal (positive or negative), then probe an unknown wire. If the RED LED lights up with a voltage reading and buzzer sound, the wire is positive. If the GREEN LED lights up, the wire is negative.\u003c\/p\u003e\n\n\u003ch4\u003e3. Circuit Continuity \u0026amp; Break Test\u003c\/h4\u003e\n\u003cp\u003eWith the alligator clip connected, probe along the wire path. If the tester lights up at point 1 but not at point 2, the wire between those two points is broken or disconnected — pinpointing the fault immediately.\u003c\/p\u003e\n\n\u003ch4\u003e4. Short Circuit Tracing\u003c\/h4\u003e\n\u003cp\u003eClamp to a battery terminal and trace along the suspect wire. The LED and buzzer will indicate live voltage wherever the circuit is intact, helping you track down shorts quickly.\u003c\/p\u003e\n\n\u003ch3\u003e⚠️ Safety Warnings\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eFor use in \u003cstrong\u003eDC 6–75V environments ONLY\u003c\/strong\u003e. Do NOT use with AC current or voltages above 75V.\u003c\/li\u003e\n  \u003cli\u003eSparks may occur at the probe tip. Do NOT use near combustible gases, dust, or flammable\/explosive materials.\u003c\/li\u003e\n  \u003cli\u003eStop using immediately if the tester is damaged.\u003c\/li\u003e\n  \u003cli\u003eThe probe is sharp — handle with care during use and storage.\u003c\/li\u003e\n  \u003cli\u003eDo not clean with chemical reagents such as alcohol.\u003c\/li\u003e\n  \u003cli\u003eDo not attempt to disassemble the unit.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e EM289\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Aermotor\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eVoltage Range:\u003c\/strong\u003e DC 6–75V\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDisplay:\u003c\/strong\u003e LED Digital\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLead Length:\u003c\/strong\u003e ~13.12 inches (spring-type)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCertifications:\u003c\/strong\u003e CE, RoHS\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBatteries:\u003c\/strong\u003e Not required\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOrigin:\u003c\/strong\u003e Mainland China\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat's in the Box\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1 × Aermotor EM289 Car Circuit Tester\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eRelated Products You May Like\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003ca href=\"\/products\/22awg-glass-tube-fuse-holder-5x20mm-6x30mm-screw-type-10-pack\"\u003e10-Pack 22AWG Glass Tube Fuse Holder 5x20mm \u0026amp; 6x30mm Screw\u003c\/a\u003e — Protect your vehicle's circuits with quality inline fuse holders.\u003c\/li\u003e\n  \u003cli\u003e\n\u003ca href=\"\/products\/100-pack-disposable-nitrile-gloves-latex-free-white-oil-proof\"\u003e100-Pack Disposable Nitrile Gloves – Latex-Free, White, Oil-Proof\u003c\/a\u003e — Stay protected during automotive electrical work.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eAuthoritative Resource\u003c\/h3\u003e\n\u003cp\u003eFor guidance on safe electrical work and tool usage standards, visit the \u003ca href=\"https:\/\/www.osha.gov\/electrical\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eOSHA Electrical Safety page\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What voltage systems is the Aermotor EM289 car circuit tester compatible with?\u003c\/h4\u003e\n\u003cp\u003eA: The EM289 is designed for DC 6–75V systems, making it compatible with standard 6V, 12V, 24V, 48V, and 60V vehicle electrical systems — covering most cars, motorcycles, trucks, and heavy equipment. It is NOT suitable for AC current or voltages exceeding 75V DC.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Does the EM289 car test pen require batteries to operate?\u003c\/h4\u003e\n\u003cp\u003eA: No batteries are required. The EM289 car circuit tester is powered directly by the electrical circuit being tested, so you can use it right out of the box without any battery installation.\u003c\/p\u003e\n\n\u003ch4\u003eQ: How does the LED polarity indicator work on the EM289 test pen?\u003c\/h4\u003e\n\u003cp\u003eA: The EM289 uses color-coded LEDs to instantly identify polarity: a RED LED indicates a positive connection, while a GREEN LED indicates a negative connection. An audible buzzer also sounds when voltage is detected, providing both visual and audio confirmation during diagnosis.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Can the Aermotor EM289 detect short circuits as well as open\/broken circuits?\u003c\/h4\u003e\n\u003cp\u003eA: Yes. The EM289 is a multi-function diagnostic tool capable of detecting circuit breaks (open circuits), short circuits, and tracing wire paths. By clamping the alligator lead to a battery terminal and probing along wires, you can quickly identify exactly where a fault or short occurs in a vehicle's wiring harness.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What voltage systems is the Aermotor EM289 car circuit tester compatible with?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The EM289 is designed for DC 6–75V systems, making it compatible with standard 6V, 12V, 24V, 48V, and 60V vehicle electrical systems — covering most cars, motorcycles, trucks, and heavy equipment. It is NOT suitable for AC current or voltages exceeding 75V DC.\"}}, {\"@type\": \"Question\", \"name\": \"Does the EM289 car test pen require batteries to operate?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"No batteries are required. The EM289 car circuit tester is powered directly by the electrical circuit being tested, so you can use it right out of the box without any battery installation.\"}}, {\"@type\": \"Question\", \"name\": \"How does the LED polarity indicator work on the EM289 test pen?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The EM289 uses color-coded LEDs to instantly identify polarity: a RED LED indicates a positive connection, while a GREEN LED indicates a negative connection. An audible buzzer also sounds when voltage is detected, providing both visual and audio confirmation during diagnosis.\"}}, {\"@type\": \"Question\", \"name\": \"Can the Aermotor EM289 detect short circuits as well as open\/broken circuits?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes. The EM289 is a multi-function diagnostic tool capable of detecting circuit breaks (open circuits), short circuits, and tracing wire paths. By clamping the alligator lead to a battery terminal and probing along wires, you can quickly identify exactly where a fault or short occurs in a vehicle's wiring harness.\"}}]}\u003c\/script\u003e","brand":"Oasis Select","offers":[{"title":"Circuit tester","offer_id":47710896783465,"sku":"14:10#Circuit tester","price":43.02,"currency_code":"USD","in_stock":true},{"title":"Circuit tester 1","offer_id":47710896816233,"sku":"14:193#Circuit tester","price":43.04,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0679\/7931\/3257\/files\/Se2b16e795fc54646b6cd12d1279ff6eac.webp?v=1782062690","url":"https:\/\/oasis-select.com\/products\/aermotor-em289-car-circuit-tester-dc-6-75v-led-voltage-test-pen","provider":"Oasis Select","version":"1.0","type":"link"}