523 Simpson, cat. 15010 0-100 dc milliamp analog panel meters, designer series 0-100 dcma 3.5"" designer a---- Glass window Optimum viewing Rugged black plastic case The designer style analog panel meters have a sharp and clear scale, this uncluttered design offers maximum visibility in minimum required light. They also have a red knife edge pointer for precision readability. High density black plastic 1.5 second maximum response time