Revox B77 high precision custom OLED counter 

- Two display modes : 4 digits matching the original look, and 5 digit high precision mode (lowest digit changes three times for one complete reel turn), switchable with push button. Short press: reset counter to zero, long press: switch display mode.
- no additional sensor installation required, using existing Revox tachometer.
- retains counter value and mode on power down.
- high speed white or blue OLED SPI display
- high precision counting: no belt slipping,
- no counter mechanical noise, no belt wear and no burden on right reel.
- custom made digits
- upgradeable firmware.