Will this test for THC in the atmosphere and up to how many feet?

No...it detects THC residue on surfaces not THC air particles

Would this test residue from a wall of a room that I suspect someone is smoking in?

Only if you can see the residue on the wall itself, or take a cotton swab and get off some residue to use for testing. windows are also a good place to check for this

I have a smell in my condo that I cant tell if its mold or marijuana. Can this test tell me if the neighbors are smoking marijuana?

It tests surfaces for trace amounts of THC...not trace amounts in the air

Can this be used on hands to see if a student has recently smoked?

Yes...on any surface including hands

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Are the products genuine and authentic?+

Yes, all products are sourced directly from authorized retailers in the US, UK, UAE and India. We maintain strict quality control processes and verify each product before shipping. All items come with applicable manufacturer warranties and are covered by our standard return policy.

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Delivery times vary by destination country, typically ranging from 3-9 business days. Each order is fully trackable through our system. We handle all customs clearance and use reliable courier partners for last-mile delivery. You'll receive regular updates about your order status via email and our app.

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Desertcart is an international e-commerce platform operating since 2014. We securely process thousands of orders globally each day. Every product goes through our quality verification process before delivery, and we provide end-to-end order tracking, 24/7 customer support, and a comprehensive returns policy to ensure a safe shopping experience.

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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.