MT100 : Very useful but...

This little device is very useful. Once calibrated, it is very accurate. It does need a quiet room to work perfectly: I found that if I used it in a pub I had to remove it from the head of the guitar and hold it next to the strings - tricky enough since most of us have only 2 hands...

Once the battery provided ran down I bought the same type of battery and fitted it. There must be some problem with the voltage as the lights do not remain steady, but vary from flat to sharp wildly. In essence, the tuner is no longer reliable.

To sum up, then: the tuner is good value for the price, but tricky to use in a noisy environment. Be careful with the battery when replacing the original, as slight voltage fluctuations may render the tuner unreliable.