220
220v
amplifier
cable
check
conductor
connection
contact
danger
digital
display
electric
electrical
electrician
electricity
electronic
equipment
flow
high
instrument
isolated
isolation
lamp
light
measure
measurement
metal
metallic
meter
neon
pen
power
probe
red
screw
screwdriver
technician
technology
test
tester
tool
type
volt
voltage
voltmeter
white
wire