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vendoritemnotes
PieraIPS-7100

https://pierasystems.com/products/piera-7100-intelligent-particle-sensor/

only $100 and unlikely to give the performance we need but does claim to give particle size histogram

PlantowerPMS5003

https://www.plantower.com/en/products_33/74.html

https://pubs.acs.org/doi/epdf/10.1021/acs.estlett.3c00030 - does better (allegedly) than IPS-7100 at <1 micron

*has been found to not always adhere to manufacturer guarantees

TemptopPMD331

https://temtopus.com/collections/handheld-particle-counter-1/products/temtop-pmd-331-handheld-particle-counter-dust-monitor-air-quality-monitor-dust-meter-laser-particle-sensor-for-pm0-3-pm0-5-pm0-7-pm1-pm2-5-pm5-pm10?variant=40680606466096

Goes below 1 micron, is designed to be handheld, well-regarded


A potential non-commercial option from NASA is MPASS: https://technology.nasa.gov/patent/LEW-TOPS-19 → Could send them an email to see if it's an option for us.