I bought one similar to those today from Bothners N1 - priced at R119! It is a Cort E610C Chromatic tuner. Bargain!

I like the fact that it changes from amber to green when in tune. Not even read the manual to see what all it can do yet - it has three buttons that I have not figured out yet. I think one switches between mic and picking up vibrations through the clip. Took it out of the box, tuned my electric and then took it to band practice tonight. Tuned while everyone else was tuning (I was worried that it might pick up all the noise in the room).