DC to 10 MHz, 100 Amps Continuous/500 Amps Peak Current Probe, 8 Meter Cable. The XL probes are designed to operate with the AM503B and AM5030 Current Probe Amplifiers. They are incompatible with the older AM503 and AM503A amplifiers. The XL (for extra long) probes have eight-meter cables, which allow you to reach test points on large devices such as heavy duty motors or automobiles. In addition, connecting to test points on transportation platforms such as trains, ships or aircraft is much easier with the XL probes.