edelbrock a/f meter--has anyone used it?

Summit is selling an Edelbrock A/F meter for $129. Has anyone used this meter. It doesn't say, but it looks like a wideband as it measures from 12-15 although I've never seen one that cheap. Don't the narrowbands only measure in the 14 range. Correct me if I am wrong and please provide any input you have about this setup.

thanks
LB

is it a narrow band though?