if it helps any , I paid roughly about $120.00 for my Hanna PH Combo Pen. Not only does it give me PH reading, I can do PPM readings too, which is equally important to me. I know the price is a bit steep, but didn't your mother always tell you. "You get what you pay for"!? If the price is to steep, Hanna sells several other models less expensive. Also "Milwaukee [sp] make a PH Pen too at half the price!!!!