9.4mm, 3.5 Digit AC Ammeter. Built-in current transformer for direct measurement Large red LED display Sub-miniature installation package 2000V isolation; UL/CSA recognised H22.4 x W35 x D25.4mm Panel cut-out: 33.9 x 21.3mm Depth behind panel: 50.08/52.78/63.28mm (depending on range)