Oktett
From CPCWiki - THE Amstrad CPC encyclopedia!
Digital multimeter/oscilloscope for the CPC from Otten/Fecht. Displays measured results on the screen.
- Amperes - range 0.03mA .. 1A
- Volts - range 0.03V .. 1000V
The advert suggests that one can also use it as audio playback/sampling device (sampling should be possible, but playback may require additional hardware).