The Safe dip from Solaxx is a digital chemistry reader designed to make measuring pool parameters easy. Until now, other products which claimed to be similar really didn"t give the user the ability to measure so many parameters with such accuracy. The Safe dip doesn"t require any test strips to work. Simply collect the water sample from the pool or spa using the onboard cup and press the Start button to take your measurement. Its smart, simple, and gives you results in seconds. The large digital LCD display and easy push- buttons make the meter easy to read and easy to use. Safe Dip measures pH, free chlorine, salt, TDS, ORP and temperature. Sensor technology is fast, accurate and durable. Built-in sample cup allows user to retrieve water sample and take readings away from the pool. LED indicator light illuminates if pool is safe to swim. Safe Dip is encased in a water resistant housing and the probe protector keeps electrodes safe and has a storage area while taking readings. Can be used on many types of water including pools, spas and ponds. Requires (2) AAA batteries (included).