High PerformanceAutomotive trailer socket tester is made of high quality ABS and copper material, frosted surface, durable and reliable, ensures maximum strength and durability for long lasting use. Such a handy trailer tester tool you will need. Packing list: K4216; 1 * 7-Pin Trailer Tester Tool; 1 * English Guide Application & SpecificationThe trailer tester socket is widely suitable for caravans, RVs, RVs, vehicles, trailers, etc. 20*5*4cm; Battery type: 9V (not included, you need additional purchase) Battery type: 9V (not included, you need additional purchase) Package size: 20 * 5.5 * 4.5cm / 7.9 * 2.2 * 1.8in Package weight: 194g / 6.8oz Function to testThis trailer hitch socket has one side to connect the 7 pin plug of a trailer and another side to connect the 7 pin plug pins of a car. This tester quickly indicates whether a fault is in car wiring or trailer wiring, which can effectively test the problem of 7-pin plug and socket connection. Reliable QualityThe trailer tester 7-pin connector with safe and reliable performance, reasonable design. Skillful appearance, convenient use. Reliable quality and delicate workmanship persuade you to take this one to replace the old one. Specifications: Main Material: ABS and Copper Color: Black Item Type: Diagnostic Tools Item Name: Trailer Tester Size: approx. 20*5*4cm Guaranteed Service Brand new 7 pin trailer test tool, comes with English paper guide. Professional, aftermarket aftermarket replacement. In terms of any problem of this product, you can send emails as soon as possible We will provide you with excellent customer service and 100% satisfaction guarantee. BUY WITH COFIDENCE!