With the analog K40 lasers the pot to set the power level is very bad, hard to set exact value.
This is a upgrade kit, with a small digital display and a multi-turn potentiometer. This makes it easier to set the power level by higher resolution on every turn.
The display shows a value between 0 and 5.00, where 0 is full power and 5.00 is no power.
Easy for you to remember a value for cutting, turn the potentiometer to that value and go!
The kit is pre-assembled, you only need to replace it with quick connectors on your current machine. Instructions are included.