This item ships as a hazardous material under DOT regulations (UN1170
Barcodes: 686720569104 (UPC-A)
Apply to Dry Surfaces: For the best results
100-gallon durable grow bag
instructions and a 9V battery in a protective
HM Digital Pro Series Pen style pH/TDS/EC/Temp meter Fertilizer This item ships as aDescription COM 300: Waterproof Professional Series pH EC TDS Temp Meter The COM 300 is a professional grade level pH EC TDS Temp meter ideal for all water quality testing, hydroponics, water purification applications, wastewater regulation, aquaculture, colloidal silver, labs and scientific testing, pools and spas, ecology testing, boilers and cooling towers, water treatment and more. Features Measures Potential Hydrogen (pH), Electrical Conductivity