In principle this type of probe can be used at any frequency, but at DC and lower frequencies circuits often have high impedances that would be unacceptably loaded by the probe's low 500 or 1000 ohm probe impedance.
The probe can theoretically operate across all frequencies; however, at DC and lower frequencies, circuit impedances are usually very high, which could be negatively influenced by the probe’s low 500 or 1000 ohm impedance.