Fluke 707 Loop CalibratorFluke 707 Loop Calibrator The fastest, one handed tool for loop checks The Fluke 707 Loop Calibrator is a high performance solution for calibration, repair and maintenance of current loops. Use it to temporarily replace the power source in a current loop. With the calibrator in control of the current, you can accurately set the current between 4 and 20 mA. This allows you to control the loop and the devices connected to it which means you can control