Fomazine Liquid Solutions for Pyxis Lab® Turbidity Devices. Choose between 2, 10, 20, 50, 100, 200, 500, or 1,000 NTU Turbidity Calibration Standard Solutions or the Turbidity Calibration Combo Kit (50, 100 & 200 NTU Solutions) to calibrate your inline or handheld Pyxis Lab® Turbidity device.