I use both an HTH 5in1 test strip as well as Pond Care's Wide Range test drops for PH. So far, they've both been fairly close on PH. I'm considering the API Pro kit so I can see what the Nitrate and Nitrite levels are. Not that I'd know what to do with them...lol.

.10 surface acre pond, 10.5 foot deep. SW LA. The epitome of a mutt pond. BG, LMB, GSF, RES, BH, Warmouth, Longear Sunfish, Gambusia,Mud Minnows, Crappie, and now shiners!!...I subscribe!!