APG DDL [DDL-D] Large-Display Panel Meter, 12-24 VDC The APG DDL Large-Display Panel Meter is an analog-input meter with 2.80" digits, multiple output and display options, two configurable six-character lines, and four LED alarm indicators. The unit is 10.63 x 12.59 x 4.77in (270 x 319.7 x 121.2mm). The DDL is programmed with the four buttons below the display or through a USB connection to a PC.