Metronome?

So I'm looking at metronomes, and I'm pretty stumped. What do I need to look for? I'd think for my uses (playing piano with correct tempo), a pretty basic one would work right?

On a side note, how can something that just clicks at intervals of time cost over $100? Seems kinda crazy to me, but I'm sure there's some good reasons/features I don't know about.

Here's a couple I was looking at:

http://www.guitarcenter.com/Matrix-MR-500-Quartz-Metronome-210023-i1125458.gc

http://www.guitarcenter.com/Korg-MA-30-Digital-Metronome-101863744-i1125668.gc

Thanks!

-Eric

Yeah, a basic one should work as long as its on beat. Might be some very cheap ones that dont really deliver. But Mine, on my piano got all the timesignatures like 4/4 - 3/4 ect And goes from 32 - 240 bpm

The one's your looking at are pretty good.. though I prefer old fashioned wooden metronomes. But those are a bit too expensive.
http://www.sabine.com/sabine-music-accessories/mt-9000.htm
I also have this metronome. It's also a tuner and a tone generator. Got it for about $50. Works pretty good.

Hi there,
A mechanical metronome is a piece of art. It has to maintain the exact tempo over a wide range of settings (speeds) and work indepently of the springws tention, the air pressure in the room, the temperature and the hunidity. So it has a very delicate and complicated mechanism to allow it to do just that. Such a mechanism costs and this is what you pay for.

Electronic (sometimes caled digital) metronomes rely on exact crystals as their clock (tempo) generators and are tchnologically simpler to design, build and manufacture than the mechanical ones. Electronic metronomes should cost significantlly less than a mechanical ones and be equally good. The thing is that comercially people have gotten used to the high price of mechanical metronomes and the manufacturers and sellers of digital ones use it to their advantage and push the prices higher than what it really cost them to manufacture.