SenSafe® Mercury Check for water quality testing is a quick and easy method to test for high levels of Mercury in your water. SenSafe® Mercury Check utilizes groundbreaking patented technology in our SenSafe® test strip. Fast, efficient, cost effective, and easy-to-use are the qualities that make SenSafe® Mercury Check a must have when testing for Mercury. This test will only detect Hg+2 ions in the sample. Other metals will interfere.