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It's a dynamometer, not a dynameter. (A dynameter is something else entirely.) Its primary function is to measure torque and absorb energy. It has to be appropriately sized to the application -- bigger engines need a bigger and more capable dynamometer. They typically need a source of cooling water if used for long periods (as for engine break-in). Something that can measure torque and absorb energy is incredibly useful for diagnosing, tuning, and modifying engines. It doesn't (and doesn't really need to) do anything else. The primary market is likely to be agricultural equipment mechanics. I can also imagine interest from serious tractor pull folks. It could, I imagine, also be employed by auto hot-rodders, but would need significant adaptation to the much broader RPM range involved, and some means of transmitting power to the PTO input. This product, or a later derivative, is evidently still made and sold new (try a web search for "Hydra-Guage"). I'd buy it just for curiousity value, but only at a price far less than it likely sold for originally...
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