Measures pH, free-chlorine, salt, TDS, ORP and water temperature quickly and easily. The Safedip Digital Tester is a digital chemistry reader designed to make measuring pool parameters easy. It doesn t require any test strips to work. Simply collect a water sample from the pool, spa or pond water using the on board cup and press the start button to take your measurement quickly and easily. It s smart, simple and gives you results in seconds! Works with pools, spas and ponds. Similar products don t give you the ability to measure so many parameters with the accuracy of Safedip!