GTL-137 is a test lead manufactured by GW INSTEK. It is designed to work with their ASR-3200, ASR-3300, and ASR-3400 models. The lead is a two-wire test lead with high quality, safety features, and resistance to RF interference. It is ideal for use with an oscilloscope, digital multimeters, function generators, and other instruments that require two-wire connections. The lead's PVC insulation is designed to last for years in harsh environments and the 24k gold plated tips offer superior conductivity and contact integrity.