Buckleys Calibration Pro Operating Instructions Manual page 5

WARNING: High Voltage equipment should not be used in any combustible
atmosphere as the high voltage will cause a spark, and an explosion could
result.
The design of the Calibration Pro' will protect the operator from receiving a
dangerous electric shock. When in use, the meter should be secured to a good
earth connection at all times.
WARNING: High Voltage equipment should not be used in a situation where it
would be exposed to damp or wet conditions or where the amount of
conductive dust is greater than would occur in a normal situation.
The high voltage supply must not be switched on until both ends of the HV lead
have been securely fastened to the HV supply and the meter, and both have been
earthed.
WARNING: This equipment MUST be earthed. To not do so may result in electric
shock.
Position the HV supply and the Calibration Pro' so that the [ON/OFF] switches are
easily accessible to the operator whilst the unit is in use.
WARNING: This equipment is only intended for use with a smoothed DC supply. It
should NOT be connected to equipment that generates a high frequency AC
or pulsed DC output.
Calibration Pro'
5