Test leads are equipment for use in testing electrical equipment, machinery, and electronics. They connect the device under test to the test meter, scope, or analyzer in order to monitor electrical signals such as voltage, current, or frequency. A test lead may have one or more cables made of flexible wire encased in a plastic shield. Leads have a connection on one end that attaches to the meter. This connection may be a banana plug, BNC connector, or other standardized format. Test leads connect to the device under test with a probe. Test probes come in a variety of forms and may be alligator clips, clamps, stick probes, or pins. Multimeter test leads sometimes come in sets that contain a variety of leads with different types of connectors and probes for a range of applications. Manufacturers include Fluke.