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Easy Connection: Plug one end into your vehicle's 7 pin socket and the other into your trailer's plug for instant testing,no setup needed Ergonomic Design: Comfortable 7 pin socket fits perfectly in hand,delivers consistent performance,reduces fatigue during repeated diagnostic work Quick Diagnostics: Identifies electrical issues in vehicle and trailer lighting systems within seconds,helps you find faults fast and save time Quality Materials: Crafted from ABS plastic and copper components,maintains reliable performance through regular use,durable for workshop and personal use Multiple Uses: Handy for workshops,rental services and personal vehicles,suitable for commercial and private needs including caravan,RV,cars,truck and tractor