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A comment on IKEA made a smart air quality sensor to track indoor pollution. Parent comment

Re:IKEA made a smart air quality sensor to track indoor poll... by billiallards on Thursday February 16, 2023 @11:25AM (#34820778)
Looks like <$30 to buy a single unit on DigiKey with a prevailing price ~$40, but you'd probably need a reflow oven to solder the unit. $60 for an assembled board at retail.

Bulk retail is closer to $20, so OP may not have been referring to negotiated wholesale volume pricing.

https://octopart.com/search?q=scd40&currency=USD&specs=0

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Re:IKEA made a smart air quality sensor to track indoor poll... by MichaelZuo on Thursday February 16, 2023 @03:49PM (#34825847)
$60 for an assembled unit at a retail store when the sensor alone is $20-$25 in bulk?
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