A Battery and Alternator checker , Comes with a magnet so you don't need to keep catching it when you rev the engine up.
Little lights display for ' bottom to top . Battery not charged , half charged , fully charged ... Then Charging Ok . charging fully , over charging.
Checked against a multi meter and yep half charged battery and charging rate at 13.9 v so , OK but not charging fully ..
But for £1.19 it's handy.
