Has anyone used it or what other LR PO4 Photometer do you guys recommend?
http://www.aquabuys.com/miva/merchant.mvc?Screen=PROD&Product_Code=mi_phos_photo&Category_Code=u1&Product_Count=38
http://www.aquabuys.com/miva/merchant.mvc?Screen=PROD&Product_Code=mi_phos_photo&Category_Code=u1&Product_Count=38