If you put a cylindrical filter conversion kit on your Kawi, this filter minder is highly recommended. It is reasonably priced here, and will save you its cost many timers over. You will not need to "err on the safe side" when you think your air filter needs to be replaced. You will not spend on a new filter until you actually need one, and you will know (instead of guessing).
It is a trivial install to boot , simply screws into a threaded hole the filter housing already has for it.