The Common ESD Test
IEC 61000-4-2 is the normative reference for most commercial electronic products. Military and aerospace standards are derived from this standard and often has to be referred back to for test plan clarification. The electrostatic discharge immunity test calls for voltage levels of 2,000 to 15,000 Volts, up to 25,000 volts for automotive and some other standards. The electrostatic discharge simulators or "ESD Guns" produce voltage levels up to 30,000 volts (for overstress testing) but with current in the milliamps and is essentially not dangerous. Zapping yourself will generate a mild electrocution, less than standard performance of a taser gun.
Depending on your device under test or "DUT", if it has unstable apparatus or electrical personality, the result could reach dangerous levels. In general, exercise caution when working with voltage levels and charging up DUT.