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So while digging through boards at a place I buy from I found these CO Sensor boards, the individual modules/sensors are what I'm concerned about. Did do a little research and see that usually they contain sulfuric acid. Any advice?

I haven't acquired these yet so feel free to tell me not to touch them. (I could of course remove the modules...)

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Here to learn more so I can recycle more
My grades are my own opinion and not an official grade from Boardsort

Low grade. Possible mid.

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42 6F 61 72 64 73 6F 72 74 2E 63 6F 6D

So...the acid isn't a concern? Or remove the modules to throw in low/mid-grade?

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Here to learn more so I can recycle more
My grades are my own opinion and not an official grade from Boardsort

I didn’t read and don’t know what’s inside them. If you’re correct then no... boardsort won’t take them.

Acid = bad in recycling terms.

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42 6F 61 72 64 73 6F 72 74 2E 63 6F 6D

Wouldn't that be similar to a batt.? Or capacitor? It must be a electrolyte storage of some sort , right?
You know what board operated?

Nice save on checking items. Would that be hazmat for sure... or?

And the looks of it ,there's corrosion and neutralization flaking all over the boards.

In reality if there’s any chance of acid I’d walk away. I tend not to care about my own safety and even I have some just no-go moments. That’s a bunch of mini risks on those boards. Time to move on.

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42 6F 61 72 64 73 6F 72 74 2E 63 6F 6D

It's dust. There's a rock quarry operating where these are stored :D

It's some sort of Carbon Monoxide Sensor (lots of fire alarm type boards in this lot)

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Here to learn more so I can recycle more
My grades are my own opinion and not an official grade from Boardsort