ETI PH Aqua Pal+.
An improved version of the ETI PH Pal, the ETI PH Aqua Pal plus includes an automatic calibration feature and water resistant case. Reliable PH tester, simply dip the probe into your nutrient solution for a clear PH reading on the digital display. Easy to use budget PH tester, a must for all hydroponic gardeners. Calibration fluid required, Accessories, Nutrients and Additives sold separately.
Caution! Always check PH after mixing nutrients as final solution may change PH levels.