50 Tests of each: nitrogen, phosphorus, and potassium
For upper elementary, middle, and high school students.
Students can perform up to 50 safe, easy, hands-on tests for nitrogen, phosphorus, and potassium levels using nonhazardous TesTab® testers.
The kit comes with testing apparatus, illustrated instructions, and a laminated colour chart for comparison all packaged in a light carrying case for transportation to the field.
You get enough materials for 50 tests each.