I use blue lab everything because it ask comes with a warranty. I also work at my local grow shop so things are a lot cheaper for me then most other people, I only paid like 75-80$ USD for my blue lab ph pen and then I have the Harry Potter wand we call it, the blue lab truncheon for my ppm.Thanks for that @Cat that seems to be more in my price range, given some rep back dude... starting to get the hang of this forum... I was on THCtalk but its been down for some time and to be honest I've had more response from this forum, plus this is where the auto growers hang out. It was reading up on Tangs grows that got me here.
Stay away from Hannah meters, they have some bad batches going right now, lots of returns on their pH pen.
Milwaukee makes a descent one for a descent price too