The AD2025 and AD2028 are low cost 4¾ digit DPMs with large LED displays. Both units offer the same features and identical performance, but the AD2025 is ac line powered and the AD2028 is +5V dc powered. The AD2025 and AD2028 are interchangeable with two 4½ digit DPMs available from Analog Devices, the AD2024 and AD2027 respectively. Thus, they can be used in applications where either a 4¾ or 4½ digit display may be desirable in one basic application.