Whirlwind TLP Powercon Line Cord Portable Tester Made in USA The Whirlwind TLP (Tester Line-Pcon) is a dedicated test devices for Neutrik Powercon three wire power cords. They are battery powered continuity testers that conveniently verify the condition of power cables that are difficult to test without applying dangerous line voltage. Each of the three conductors is tested for continuity, shorts, and incorrect connections. Testing cables is as easy as plugging them in. The TLP and TLT have three green and one red LED that indicate correct wiring or any fault conditions. Operation is hands-free; there are no buttons to push or knobs to turn. A properly wired line cord will show all three green LEDs illuminated. The earth LED light comes on before the Neutral and Line LEDs to confirm the Earth connection making first and breaking last. The Whirlwind TLP is powered by a single 9 Volt battery located inside the unit. To install or replace the battery, remove the 6 case screws and connect the battery to the battery clip. Replace the bottom and close with the provided case screws. Do not use longer screws as they might puncture the battery. A battery test button is provided to confirm that the battery is capable of properly testing cables. The Earth LED illuminates when the Battery Test button is pushed and the battery is good. Echotone Music LLC has been a professional E-commerce Audio Visual Equipment dealer since 1998. We take pride in selling Pro Audio gear for clubs, concert, and broadcast applications. Shipping -Pro packed shipped USPS, UPS or Freight Service. Contact us pay for air mail upgrade on any unit. We are working hard to get your product ( built if needed), processed shipped. Processing times vary, 2-30 days Returns/Refunds- Customer pays for return shipping. Returned items must be sealed/unopened to qualify for a full refund. Refunds are for the Item cost only. Gear returned without all its original packaging, accessories or shows signs of wear, is subject to an additional service fee. This item is now used and it would be unfair to resell to another customer as new. What products can not be returned? - International Sales Clearance items, Custom Builds, Road Cases, DT12 items, items identified as non-returnable, discontinued items, used or NOS items, electronic software downloads, demo gear, computer Cards, vacuum tubes, earbuds, raw-frame speakers, turntable cartridges, fog fluid.