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    OTC 3633-10 Replacement Bulb

    Part #: CT-BULB-R

    The OTC 3633-10 is a 10-pack of red replaceable bulbs designed for OTC’s 3633 Mini Coil Cord Circuit Tester (and compatible models). These bulbs restore visibility for diagnosing 6 V and 12 V circuits by providing bright illumination in the tester’s probe when a circuit is energized. Ideal for service shops, diagnostics kits, or maintaining your existing OTC 3633 without replacing the entire unit.