The Lishtot TestDrop Pro Instant Water Quality Tester tells you that your drinking water is safe. Whether you’re traveling abroad or are worried about your home’s water quality, this water tester will give you the information you need. Because this keychain water tester can find more than 20 water contaminants, you’ll know about E. coli, lead, pesticides, and more. The test takes just two seconds, and the reusable battery lasts for thousands of tests. So if you’re trekking the Himalayas, you won’t have to replace the battery. Furthermore, it uses an easy to read system of a red or blue light. If the light turns red, it detects a contaminant. But if the light is blue, the Lishtot TestDrop Pro determines the water is okay to drink. And if you want more information, you can send detailed data straight to your smartphone app.