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The Fluke 718Ex Intrinsically Safe Pressure Calibrator is only compatible with the Fluke 750PEx and 700PEx intrinsically safe  pressure modules. The 718Ex is not compatible with the non-Ex modules, and the 750PEx and 700PEx module are only compatible with the 718Ex and 725Ex calibrators. In other words, Ex models and non-Ex models can't be mixed with each other.