Yea I am, I was worried cause my ph scale only goes down to 6.0 and my water's lvl (only used 1/4 strength nutes this week) was close to 7.0, took a while to get it down to 6.0, like 60 or more ph down drops, so I was a little concerned about its accuracy. I ordered a hydroponic specific ph kit online so that should be here for the next res change.