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