So I bought this because I didn't have much money for a decent tuner and I saw it was true bypass and I like that it has two buttons and two outputs. One for pitch and on for flat, the outputs are direct and bypass, direct is cut when in use bypass is not, you can use both of these with two amps in a stereo set up.
The tuner its self is very accurate I have found and the construction is very solid. It uses either a 9v battery that is included or a 9v power supply. The battery hatch doesn't need to be unscrewed either, its just a clip like the back of a tv remote which is nice and easy, feels sturdy enough but can imagine the springiness of the clip wearing out and the battery cover falling off as a result after a lot of use.