JBL Phosphate Test Kit PO4 for Koi detects the algal nutrient phosphate in ponds. Test Kit for 50 Tests. Only 2 reagents for quick and easy handling. Due to the higher feeding needs in koi ponds this test also displays high values of up to 10.0 mg/l. Scale: <0.1, 0.25, 0.5, 1.0, 1.5, 2.0, 3.0, 5.0, 10.0. Includes compensation system, color chart, syringe, 2 glas cuvettes and dosage spoon. Do you have questions about this article ?