

⚡ Test smarter, not harder — reach every circuit with confidence!
The OTC 3639 Extra Long Heavy-Duty Circuit Tester features a 7-inch stainless steel probe and a 12-foot heavy-duty coil cord, designed for precise testing of 6V and 12V electrical systems. Its ergonomic handle, positive soldered clip, and molded strain relief ensure durability and reliable contact, making it an essential tool for professionals tackling complex electrical diagnostics.
| Manufacturer | OTC |
| Brand | OTC |
| Model | 3639 |
| Product Dimensions | 10.54 x 33.27 x 4.06 cm; 1 g |
| Item model number | 3639 |
| Manufacturer part number | 3639 |
| Item Weight | 1 g |
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