[Merck Millipore Corporation] M Color Test(TM) Phosphoric Acid Test Measurement Principle: Colorimetric Analysis (Using Colorimetric Box And Short Tube), VM Method 1.0-2.0-3.5-6.0-10-20-40mg/L PO4-P 3.1-6.1-11-18-31-61-123mg/L PO4(3-) Mcolortest(TM) 114449 190Tests