Ideal for commercial growers, this kit will measure nutrient solutions. Tests include pH (4.8–7.6), nitrate nitrogen (5–200 ppm), ammonia nitrogen (1–8 ppm), phosphorus (3–30 ppm), sulfate (0–200 ppm), calcium (0–2,000 ppm), magnesium (0–1,200 ppm), potassium (0–250 ppm) and spot detection of iron at .25 ppm. Kit and reagent refill includes enough reagents for 50 tests per parameter. Manual and 75-page handbook included. Kit weighs 15 lbs, refill weighs 1 lb.