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AMB-3 Features
•  Tests insulation of wires, cables, 
transformers and electrical 
motors
•  Battery powered
•  Helps cut unscheduled downtime 
and reduce shock hazards
•  Insulation resistance with 500 V 
DC test voltage: 0-1000 MΩ
AMB-3
Insulation Resistance Tester
AMB-3
Insulation Resistance Tester
Cut unscheduled downtime and reduce shock hazards with 
the Amprobe AMB-3. Quickly check the insulation resistance 
value of electric equipment and lines with this small, easy 
to operate tester. The Amprobe AMB-3 insulation resistance 
tester is an analog meter that measures insulation resistance 
to help reduce shock hazards and downtime on electrical 
systems that include wires, cables, transformers, and 
electrical motors. A manual range selection knob allows the 
operator to choose Megaohms or ohms measuring ranges. 
A power lock keeps the lock on to perform multiple tests. 
The unit measures voltage from 0 to 600 V alternating 
current (AC) or direct current (DC) and insulation resistance 
from 0 to 1,000 megaohms using a 500 V DC test voltage. 
The tester automatically discharges capacitance after use so 
that the test leads may safely be removed from the device. 
Test leads and a carrying case are included. The tester is 
powered by four AA batteries (included). The AMB-3 is 
designed for use by electricians and electrical contractors.
E Terminal
(Earth side)
L Terminal
(Line side)
Test lead
Scales:
a.MΩ scale
b.ACV scale
c.Battery check 
scale
Pointer
LED HV
“ON”indicator
∞Position 
pointer 
adjustment
Insulation 
resistance test 
push button 
switch
Function 
selector 
switch