Which pwm upgrade to buy

[Boostinben]

I am about ready to buy the kit to convert my k40 to awc608 but see there is a 20-45w pwm and a 40-60w for just a bit more on the site. Which is the correct one to go with?

[Tech_Marco]

Both work but get the 20~45W one as it should work better on low power engraving. If you're planning to upgrade to 60W, then get the 40~60W

Marco