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The Dinosaur Electronics P-711 Exerciser is a diagnostic test tool built for newer Dometic RV refrigerator control boards, letting you check board operation directly instead of guessing whether a board or another component is the problem.
It's a compact, lightweight tool at about 12 inches long, requiring no batteries of its own, so it's easy to keep in a service kit or toolbox for troubleshooting calls.
Handy for techs and owners who want to isolate refrigerator control-board issues before ordering replacement parts.