Does zinc cause false positive result?

Yes, Zinc can interfere with the test and give a false positive.

Can someone help me understand step 8 on the directions - it seems the longer you wait the lower the reading can get?

Yes, the longer you wait the more sensitive the test.

The epa has tested some soil to micrograms / cubic meter. can your results equate to this?

I bought this kit for school project, so I didn't know

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Industrial Test Systems SenSafe 480311 Lead Soil Test Strip, 0-400ppm Range, Five Tests

Product ID: 464100739

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📊0-400ppm precise detection

🧪5 complete test kits included

⏱️1-10 min rapid results

Description

🧪 Lead the way in soil safety with rapid, reliable testing!

ALL IN ONE TESTING KIT - Includes strips, reagent, and sample container for five hassle-free tests.
PRECISION YOU CAN TRUST - Detect lead concentrations from 0 to 400ppm with lab-grade accuracy.
FAST TRACK LEAD DETECTION - Get accurate soil lead levels in as little as 1 minute—because time is money.
INDUSTRY BACKED RELIABILITY - From a trusted brand since 1989, trusted by professionals across sectors.
NON HAZARDOUS USER FRIENDLY - Safe, easy-to-use materials with clear instructions—no lab required.

The Industrial Test Systems SenSafe 480311 Lead Soil Test Strip kit offers fast, precise detection of lead in soil across a 0-400ppm range. Designed for professionals and eco-conscious managers, it delivers results in 1 to 10 minutes using non-hazardous materials. Each kit includes five complete tests with strips, reagent, and sample container, backed by a trusted industry leader since 1989.

Specifications

ASIN	B00DIJ8JBW
Item model number	480311
Manufacturer	Industrial Test Systems, Inc (Sensafe)
Product Dimensions	9.21 x 16.51 x 1.91 cm; 10 g

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