Operating instructions – General Tools and Instruments ST400 v.2 User Manual
Page 3
• The ST400 cannot detect the
presence of voltages below 110V.
Use caution whenever detecting AC
voltages above 42VAC
RMS
or DC
voltages above 60VDC. Both pose a
shock hazard.
• Before using the tester, inspect the
case. Do not use the ST400 if the
case is damaged. Look for cracks
or missing plastic. Pay particular
attention to the insulation around
the connectors.
• Do not operate the tester around
explosive gas, vapor, or dust.
• When using the probes, keep your
fingers behind the finger guards.
Never touch the metal ends of the
probes when making a
measurement.
OPERATING
INSTRUCTIONS
1. Insert the tip of the screwdriver into
the “hot” side of a 110VAC or
220VAC outlet, or touch the tip to a
point on a live circuit.
3
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