References:
https://profesi-unm.com/2021/09/05/pkm-kc-unm-ciptakan-teknologi-pengukur-kualitas-udara-dan-air/
https://putraprabu.wordpress.com/2008/10/18/produk-bersih-cleaner-production/amp/
http://www.alatuji.com/article/detail/39/alat-pengukur-kualitas-udara#.YZ7fZaQQolQ
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