DFI 100 - Hand Held Indicator The model DFI 100 is a lightweight hand-held indicator powered by a single 9 volt battery making it ideal for remote field operations. The DFI 100 features a 3 1/2 digit display and shunt calibration for quick set-up with a minimum of warm-up time. Peak hold is standard. The DFI 100 is stocked for quick delivery.