The Fluke 707 Loop Calibrator is a well-designed, practical device which can be used for calibrating, repairing and maintaining current loops. The 707 boasts current measurement (up to 24mA), current sourcing and current simulation (both up to 20mA) as well as slow ramp, fast ramp and step ramp which ensure smooth outputs. The user can change the output in 25% steps for linearity testing using a simple push button whilst other navigation can be performed with just one hand via the rotary dial.