Where to buy an air particle counter locally?

[dcnx]

Is there anywhere in the city that sells them or do I need to order from Lazada or Amazon? 

 

If you have one, do you recommend the one you have?

 

I’m wanting to find out how much the aircon is actually letting through. I probably don’t want to know the answer because I can’t get a filter for it at the moment, everywhere I’ve looked is sold out.

 

 

Thanks.