Seems like a bargain.
http://www.maplin.co.uk/module.aspx?ModuleNo=25671&doy=6m10&QV=P

That link didn't seem to work for me but I recently bought the digital one they do for around 25/30quid, not found anything close for that money, not tried it out yet though.

They are a spot on bit of kit.

Highly recommended, (for the money)

Paul G