I like this pen alot. And I can check Conductivity, PPM, PH. all with 1 pen and for a reasonable $ I have purchased just PH pen's that cost the same or more. In my opinion I can only see 2 issues. First (the pen cap is not see through so you can not see the level of your soaking solution. )
Second ( the calibration solutions that comes with the kit you get approximately 2.oz of each so you will need to order more right away unless you use your pen only once a month if thats the case your set fo...
