The Twin Scan 3 kit is a great diagnostic tool that includes a scopemeter, which allows the display of two signal waveforms. The probe kit includes two insulation displacement probes and extension wires with mating weather-pack connectors that plug into the analog inputs on the Twin Scan 3. The insulation piercing probes allow easy connection to any point on the motorcycle wire harness. There are two switches on the side of the Twin Scan 3 that allow selection of the voltage range for the channel one and channel two analog inputs. The low range is 0-20 volts and is suitable for most signals except crankshaft position sensor, coil drive, and injector drive signals that require the high 200-volt range.; Blue and white insulation piercing probes and 48" extension wires with mating weather-pack connectors that plug into the white channel and blue channel analog inputs on the Twin Scan 3 Red and black alligator clips that can be used in place of the insulation piercing probes for accessing signals Power adaptor for use on earlier HD motorcycles with four terminal diagnostic connectors Power cord with red and black alligator clips for general purpose use with any +12-volt power source