Watch the demo here and listen to examples of knock here!
 
The Knock Detective is an audio knock detection device stuffed into a 52mm gauge. After bolting the included knock sensor(s) to your engine and connecting the Knock Detective, you can plug in headphones and listen for knock events while tuning. The device also features a bright LED display with configurable sensitivity to help visually monitor knock levels. The user can then connect the 0-5V output to an analog input on their ECU and use it to datalog the knock levels.
 
I hope you enjoy this product which I have designed and hand built in Saint John, NB, Canada.
 
View User Manual
 
Features:
- Standard 52mm gauge with 2 knock sensor inputs.
- Comes with Bosch Knock sensor(s) with 8' shielded cable(s)
- 6 LEDs to indicate knock signal level
- Adjustable sensitivity
- Headphone output for listening to the knock signal
- Adjustable volume
- 0-5V output for data-logging
- 3D Printed in high strength ABS