This new model HP-1 offers tests for pH and 3 key nutrient factors: nitrogen, phosphorus and potassium • Allows the hydroponic hobbyist to maintain proper nutrient balance and achieve optimum growing conditions in soil-less cultures • Reagents sufficient for 50 tests per factor • Complete Labware are foam-mounted in a sturdy carrying case • Instructions and 75-page hydroponics handbook supplied • Reagent refill also available (#GF-R-3561).
