If you're a guitarist, you've probably heard your instrument go slightly out of tune every time you clamp a capo onto the fretboard.
A capo is the simple spring-loaded mechanism that raises the pitch of a guitar by pushing down on the strings wherever you place it on the neck. Capos push harder than your fingers, which will usually make your entire guitar a little sharp. And the relative thickness of the low strings means they're pulled a little harder than the high strings, so the strings can easily go out of tune relative to each another.
People generally assume that "better," more expensive capos degrade your intonation less than cheaper ones, but capos almost invariably mess up your tuning. Thalia makes the bold claim that its new 200 Series capos $60 to $90, depending upon the finish) will change the pitch of your guitar without noticeably impacting the intonation. The capo does this with a unique design: a set of swappable fretpads, so you can find the one that best matches the size of your guitar's neck and keeps the intonation drift to a minimum.
The 200 is beautiful, which seems strange to say about a capo. I reviewed the black chrome version, which in my case also had a blue abalone inlay. It looks exceptional, and it feels well made.
The 200 series includes a couple of "tuning kits"—two sets of removable Teflon and rubber fretpads (seven of each, 14 total) sized to fit a particular guitar neck. By using the correct fretpad, you are essentially customizing the capo to your guitar's fretboard radius. My Seagull, for example, has a fretboard radius of 16 inches, so I needed to snap the appropriate fretpad into the capo. Simple, and the quick-start guide (a capo with a quick-start guide!) includes a chart showing which size fretpad you need for your make of guitar. If your guitar isn't listed, Thalia offers a guide for determining your fretboard radius. If you play a 12-string, a ukulele, or a mandolin, you can buy the appropriate pads.
I started with a Teflon fretpad. Clamping it at the second fret left my guitar slightly sharper than it should have been—and I really do mean slightly. All of the strings remained in tune with one another. If I was playing solo, I wouldn't have noticed, and I had to pull out my tuner to check. I'm not even sure I'd have noticed the change in intonation playing with other musicians.
