The Rennacs Relative Compression reader allows you to quickly and easily check the relative compression on any car, 4-6-8 Cylinders and more.
Following on with the simplicity of the other Rennacs Products, the compression tool is very simple to use. The compression tool works by monitoring the variations in the battery voltage produced by the starter while cranking.
These variations occur because of the changes in rotational speed due to the compression and expansion of each of the cylinders.
Please Note: To use the Rennacs Relative Compression software, you must already own a registered version of Rennacs CodeReader.