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"Speical Price and free shipping" EXEDX501 - Exergen DX-Series IR Thermometer For the best racing performance, your engine must be tuned properly. To tune your engine properly, you need to measure true engine temperature. We are proud to say, the DX501 and D501?s are the only standards in the industry to make that measurement. The DX-Series is an entirely different type of instrument than conventional temperature measuring devices. Designed specifically for the highest possible accuracy, it is the only infrared instrument which can be certified with NIST-traceable accuracy on real surfaces of unknown emissivity, while remaining completely free of the contact errors and heat sinking errors of contact devices.