The GVC scroll mount tuner fits perfectly on the scroll of a violin or viola but can be used to tune all acoustic musical instruments. It picks up vibration by direct contact. Its head swivels for easy viewing from many angles. The backlit display is clear and bright. The tuning needle points directly up at the center and the display turns green when in tune. The tuner powers off when not in use to conserve battery power. The battery is a standard 3V CR2032 and is included. The tuner comes in an attractive GVC branded plastic package that can be hung on a peg. A great innovative product at an affordable price.