HB MT100

This is a very versatile clip-on tuner, well worth the money. It's way better than what most built-in tuners (in amplifiers and multieffect pedals) will offer you. It's very reliable, easy to use and is generally ready for any situation. You can change the calibration so if you want to try different tuning calibrations (such as A4 = 432Hz) it will allow you to tune to that tuning instead of the standard (A4 = 440Hz)

Overall: This tuner is very versatile especially considering the price, and will not disappoint you. If you are looking for a good clip-on tuner and you don't want your wallet to go on a diet, look no further. You can't go wrong with this.