I spent $60 on several brands of cheap ph/ec/tds meters from amazon before I finally bought a Hanna combo pen. My friend has one as well, that's why I got mine. He worked in a water testing lab so he knew about hanna quality from the instruments they used.
Mine is over a year old now, and working perfectly. I used the included hanna storage solution in the cap when I had to store it for a few months off, I also stored the pen in a large mason jar with a moisture pack to prevent the tip from drying out. They sell replacement tips so an entirely new pen is not required if the tip does malfunction. I know it is top dollar, but so far, well worth the investment. Unfortunately, the price is now $225, I paid $150. Inflation sucks!
