Tolmuloendur valmistatakse ette imipumba ühendamisel katseklaasiga, mis on seinatud niiske paberiga, ja sellega mõõtmisel katseklaasi hoitakse valgusallika suunas ja pump lülitatakse korraks sisse, tolmuosakesed klammerduvad paberi külge, tekitades nähtava värvimuutuse.
The koniscope is made by connecting a pump with a test tube that is walled with moist paper. The tube is held towards a light source and the pump is briefly activated. Dust particles will cling to the paper, producing a visible change in color.
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