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The Pie 511B model simulates RTD resistances into all types of process instruments including transmitters, recorders, controllers, alarms, data acquisition, and computer systems. No longer will you need to need to Lug a decade box around or make errors reading RTD tables incorrectly. The Pie 511B is a superior replacement for decade boxes while eliminating errors caused by misreading RTD to resistance tables by allowing you to dial directly in temperature. The Pie 511B has better accuracy than many higher priced RTD calibrators.