18Safety instructions• The device must only be used in accordance with its intendedpurpose and within the scope of the specifications.• The measuring tools and accessories are not toys.Keep out of reach of children.• Modifications or changes to the device are not permitted, thiswill otherwise invalidate the approval and safety specifications.• Do not expose the device to mechanical stress, extremetemperatures or significant vibration.• Exercise extreme caution when working with voltages higher than24 V/AC rms or 60 V/DC. Touching the electrical conductors atsuch voltages poses a risk of life-threatening electric shocks.• If the device comes into contact with moisture or other conductive-residue, work must not be carried out under voltage. At and abovevoltages of 24 V/AC rms / 60 V/DC, the presence of moisturecreates the risk of life-threatening electric shocks.• Clean and dry the device before use.• When using the device outdoors, make sure that the weatherconditions are appropriate and/or that suitable protection measuresare taken.• In overvoltage category III (CAT III - 600 V), the voltage betweenthe test device and earth must not exceed 600 V.• In overvoltage category IV (CAT IV - 600 V), the voltage betweenthe test device and earth must not exceed 600 V.• The lowest overvoltage category (CAT), rated voltage andrated current apply when using the device together withthe measuring equipment.• Before taking any measurements, make sure that both the area tobe tested (e.g. a line), the test device and the accessories used(e.g. connection cable) are in proper working order. Test the deviceby connecting it to known voltage sources (e.g. a 230 V socket inthe case of AC testing or a car battery in the case of DC testing).• The device must no longer be used if one or more of its functionsfail or the battery charge is weak.• The device must be disconnected from all power sources andmeasuring circuits before opening the cover to change the battery(ies)or fuse(s). Do not switch on the device with the cover open.• Observe the safety precautions of local and national authoritiesrelating to the correct use of the device and any prescribed safetyequipment (e.g. electrician‘s safety gloves).EN