Gratnells Extra Deep Tray of 15 Ammeters with Lid. Digital Satz Ammeter Super strong high grade ABS case. Protective display window. Large bold 14mm LCD display. Screw locking battery compartment. Colour coded & shrouded 4mm sockets. Power: 1 x 9v PP3 battery, inc. Dims: 95 x 90 x 75mm. 12 month guarantee.