The only thing is the gaurdian is a constant read monitor so you cant compare it to pens.PartyBro420 said:Milwuakee 600. Good little pens and unlike the blu-lab meter, they're affordable for your average grower, the guardian meter is like $325 :S great piece of equip if you can afford to spend the money though.
CasualGrower said:I use a blue lab.... just got it recently and it works GREAT!.... used to use the pens and stuff... IF and I mean IF you got the money to blow.... get the Blue Lab combo meter.