Anodised blue aluminium.
The Meter tells you if the glow plug is blown or the battery is flat by not moving. If the meter moves up to the green then battery and plug are good.
Requires battery, can be charged in or out of the glow starter.
Recommended battery 4405270 (you will need to remove the plastic wrap from the battery)
You can also use a 1800 or 2100 battery without removing the plastic wrap
Fastrax Aluminium Glow Starter With Meter (Battery Not Included)