Just my opinion ifin I may add to yur thread be stayin clear of the do it all testers that be checkin ph light and moisture thisin piece of gear is nothin but crap and found myself buyin those little dip stick ph testers yu be buyin in the pet stores to check aquarium water. Ever since i be buyin these strips been happy as a squirl with his cheaks full of stolen nuts. Hopin this helps ya out.

BWD