NT-305 Contact Voltage Tester Operation Guide
1. Appearance
2. Operation
1. Voltage Test ( contact) ：
AC voltage test: press the” induction test”
button and place probe tip in contact with plug,
circuit or unit to be tested, The LED lights up
and displays voltage values.
DC Voltage Test: press the” induction test”
button and place probe tip to contact with plug
or the anode side of object, the other hand
holds the cathode side of object or press the
cathode side of object in touch with the
“induction test” button to cause a circuit to be
tested. The LED lights up and display comes out
with voltage values.
*If display 12 means the voltage is 9~12V.
*If display 12 36 means the voltage is 12~ 36V.
*If display 12 36 55 means the voltage is 36~55V.
*If display 12 36 55 110 means the voltage is
55~110V and under 220V.
*If display 220 means the voltage is above 220V.
2. Cable Detection Test (non-contact)
Press the “circuit continuity test” button and
place the probe tip near to the wires or circuit to
be tested.
If the “flash” signal is shown on the display
panel, means it is live wire. If not, the wire is not
live.
3. Circuit Continuity Test:
Set one end of the wire to contact the probe tip
and the other end of wire in touch with
“induction test” button as following pictures.
If the LED lights up, it means the wire is in the
circuit, if not, the wire is open.
4. Tester Function Test
Press the” induction test” button with your hand
and touch the probe tip with another hand, if the
LED lights up, it means it is functioning.
1. Remove the pen clip on the back side of the
tester
5. Battery Replacement：
2. Loosen 2pcs screws on the cover
3. Remove the back cover, and replace the
batteries. Please pay attention with the
polarity when replace it.
4. Put the cover back, tighten the screws and
put the pen clip back as well
Before operating, please test
