The reference in tuner ultra precise and reliable .. with a true bypass (unlike the tu12h) .. this one is quite expensive, but when it was, you would never know more .. pase auto or manual, bass or guitar, acoustic and even to get the accuracy of voice .. or if your old vrifier moog is still right on his frquences ... in short, that the bon.on can even use it in complete darkness .. (LED meter + eclair 9v battery lasts a very long time .. thank you mr.BOSS! (or the korg seiko is not bad either, but is more "gadget") and is the great epoch-BOSS ROLAND JAPAN .. real jewels. Like all pedals of this epoque.j 've even seen a guy who gives piano (pro) c is his job, use it every day. (for ages). fl is the unit ray and it still works.'s it say about the quality of this product ..