At home air quality testing

Does any one know where i could get a decent air quality test that tests CO2, VOC, PM2.5 and PM10 that can be purchased or delivered in Australia? My budget was $300AUD, are the  testers on Amazon dodgy they are going for roughly $150. Im new to testing my air quality and have recently moved to a small apartment where I believe I have some issues as there is a bad smell coming from the bathroom and I get a head ache when in there for too long.