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An automotive test pen checks 12V/24V car circuits — it traces power, ground and signals when diagnosing wiring faults on vehicles.

Yes, our car test pens support both 12V and 24V systems, covering cars, motorcycles, trucks and RVs.

Touch the probe to each side of the fuse with the circuit on. If only one side lights, the fuse is blown. See the included manual for full testing steps.

Yes, they are a fast and reliable way to diagnose wiring faults and are widely used by mechanics and auto electricians.

We are the factory in Wenzhou. For retail auto parts shelves we usually recommend the HW304, HW305 and HW306 family at three price points, plus HW80 as a compact basic pen. If your channel is professional workshops, HW170 and the HW68A/HW68B digital display pens are what we position for those customers, with WILK302 and WILK303 as a separate branded series. Tell us your target market and price range and we will suggest the exact mix for your first order.

HW68A is the digital display car electric pen with a straight line lead, and HW68B is the same digital display design with a spring line lead. Both cover the same automotive testing role, so the choice comes down to which lead your customers prefer for reaching into a harness or cable. Check the specifications table on each product page for the exact voltage range and display features. We can mix both variants in one order so you can test sell-through before committing to a larger run.

Yes, you can mix models in a container order. We accept a mixed assortment across the car electric pen line, including HW170, HW304 to HW310, and WILK302 and WILK303, in one shipment. Each model still needs to reach its minimum quantity, so send us your quantity list and we will confirm the per-model MOQ and which items are in stock versus which need production time.

Yes. We are the factory in Wenzhou and we do OEM branding on the car electric pen line, printing your logo on models such as HW304 to HW310, HW170 and WILK302 and WILK303. You can choose a standard CHINYOO box, a plain bulk pack, or a custom box with your brand and artwork. Send us your logo and box design and we will confirm the printing and tooling cost before you order.

With the circuit powered, touch one probe to each of the two small test points on the top of the fuse. A good blade fuse shows the same voltage on both points; a blown fuse shows supply voltage on one side and nothing on the other. If the fuse has no test points, pull it and check continuity instead.

Close to zero ohms, typically under 1 Ω, with the continuity buzzer sounding. A blown fuse reads open circuit, which most meters show as OL. Remember that the test leads add a fraction of an ohm of their own, so touch the probes together first and subtract that figure from what you see.

Yes, with the circuit isolated. Switch the breaker off, prove the load side is dead with a contact tester, then measure continuity across the breaker terminals: a healthy closed breaker reads near zero and a tripped or failed one reads open. Never test a breaker with the circuit live, and treat a breaker that trips repeatedly as a circuit fault to be found rather than a breaker to be replaced.

Continuity proves only that the fuse element is intact. The usual causes are a corroded fuse holder, a fuse seated in the wrong slot, a relay or switch further down the circuit, or a second fuse on the same feed. Measure voltage at the fuse with the circuit on: if voltage arrives on one side and not the other, the fault is the contact rather than the element.

Nous acceptons aussi bien les petites commandes d’essai que les commandes par conteneur. Indiquez les modèles et les quantités souhaités. Notre équipe vous communiquera les prix et délais sous 24 heures.

Oui. Notre usine, fondée en 2008, propose des étiquettes et des emballages personnalisés ainsi que des plages de mesure adaptables. Envoyez-nous votre cahier des charges.

Oui. Un échantillon vous permet de vérifier la fabrication et l’étalonnage. La livraison express prend généralement 3 à 7 jours ouvrés. Le coût de l’échantillon est déduit de votre première commande en gros du même modèle. Indiquez les modèles par formulaire ou courriel. Nous établirons un devis et expédierons après paiement.