So a meter became 1,650,763.73 wavelengths of this orange light from a krypton-86 atom. That’s an e-mailable definition, since all krypton atoms are identical, and scientist could just pick up a ...

An audio volume-unit meter displays peak-related audio amplitudes to aid in accurately setting recording levels or for displaying an amplifier's. ... and a meter-scale factor of 0 dB of 2V peak ...

The meter now shows the log of negative-input half-cycle peaks, the needle falling back as the capacitor discharges through the meter. As it stands, it works, with a very reasonable span of around 50 ...