A miniature VU - level meter for use in sound recording equipment , light meters, battery chargers, damp meters, or anything there a visual indication only is required. nice clear red and black bar markings on a silver range with a red pointer. Dims: visual face (panel cutout size) : 18mm wide x 12.3mm high mounting slots: 2mm diameter x 3mm on approx 28mm centres . depth of gauge behind fron panel :15.3mm : gauge body behind front panel : 18.6 wide x 18.2mm depth of gauge infront of panel 5mm max ( gauge face bows) Contacts : two solder tags flush to rear back of gauge. RoHS: not known.