What causes the differences in price in home testing kits for lead in water? [closed]








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The price differences between home testing kits to test tap-water for lead are huge. 
20 dollar will either [buy 1 test](https://rads.stackoverflow.com/amzn/click/com/B07BRSMF76) kit or [100 test strips](https://rads.stackoverflow.com/amzn/click/com/B0814116QB). Both are intended to test drinking-water safety.


What does this mean? Is one of the tests 100 times less sensitive? Or 100 times less accurate?
How can i as an average customer know which test is good enough?




A test kit means a set of solutions for repeated use until the are spent. How many analysis can be done should be noted on the kit package. 


Paper strips are easier to use, but may not be better for result.


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