Fluke 741B Documenting Process CalibratorFluke 741B Documenting Process Calibrator For the calibration and troubleshooting of process control instrumentation. We know how tough your job can be. You've got a lot to deliver in as little time as possible. So we've made it easier on you with our multifunction 740B Series Documenting Process Calibrators. The 740 Series does the work of several tools sourcing or measuring pressure, temperature, and electrical signals in one rugged, hand held