[quote name='mcnach' timestamp='1358704807' post='1943694']
how odd.
are they calibrated to the same frequency?
I had a tuner once, can't recall which, a Korg, and it just did not tune right... until I realised that somehow I had it calibrated A=441... all it needed was a couple of taps of a tiny button on the back (one to engage calibration, another to go up to 441... two would have meant 442...)
It happened by accident and I was very frustrated by it for a while as I was not tuned right when using it... other than that, every tuner has worked alright for me. Some are more sensitive, some take a while to get a stable reading, but they all worked for me, and my ears are not exactly covered by cloth, before someone suggests that
[/quote]
I just got them out and checked as it could have been that
They all report A=440 (Apart from the one built into my Orange practice amp as that has no other option).
They are all slightly different. Two of them are Korg units and one is a cheapy I got from eBay (the forth being the one in the amp).