The Model MLA and MLD field mounted indicators receive DC voltage or current signal inputs from electronic Transmitters and indicate process measurement values. They are available with Analog or Digital displays. Both accept 4-20 mA DC input. The MLA also accepts 10-50Ma DC and 1-5 VDC. Mounting options are Horizontal or Vertical Pipe mounting.

Yokogawa Corporation of America's standard scale for MLA is black background, white numerals and letters, 50 divisions, 0-100%. For MLD, their standard display is 0-100.0%.

The MLA and MLD series Loop indicators are designed to meet FM standards for use in hazardous locations. This type of protection is defined as explosion-proof. Both units are enclosed in a NEMA 4X case.