That sounds reasonable. Don’t know what the DX might be… distance? digital? Prolly not digital, and no date on the unit or the box. 1982, I’m guessing. Anyway this is a WP200. Price tag of $269 is still on it. Guess I’ll just have to calculate how much amperage it draws after I get it up and running. If it works, it should be visible from several feet away… the display is 6″ square. There’s a “noise reject” knob, and an on-off/ “sensitivity” knob.