Bk 440 or 466

[ARC Tech-109]

I have both a 466 and 467 and they're about the same in terms of accuracy, I can't speak for the earlier 440 model. The 467 is basically a multiplexed 466 that uses some rudimentary logic but regardless of the extra tech they're both milliamp meters measuring cathode current. Personally I like the 466 better as it doesn't have all the extra smarts but the CRT interface plug is a pain if you want to make a breakout cable. I reconfigured mine to work with the 467 Molex connector.