HKS A/F Knock Amp

The A/F meter function and "A/F-Knock.Amp.", which allows you to hear the knocking status, are the third generation model with a new display.

Feature
A Bosch A/F sensor can be used to measure the air-fuel ratio with high accuracy. (A/F sensor included)
You can hear the knocking status through headphones, which is useful for setting fuel and ignition control data using F-CON V Pro etc.
Knocking judgment and knock level can be displayed by setting the knocking judgment condition.
The air-fuel ratio and knock level can be output as voltage signals. By incorporating it into F-CON V Pro, etc., it becomes possible to control air-fuel ratio feedback, knock retard, etc.

For more details please go through the below link...
HKS A/F Knock Amp