Product Type: PGD4-W-O3 Description: The DPD method (GB11898-89), ozone DPD reagent to form a red compound. Ozone test sample color-developing agent reacts with the colored compound to selective absorption of electromagnetic radiation established colorimetric method, a light source apparatus made of silicon, a lens, colorimetric bottle, the photocell signals a microprocessor, can be It shows the content of ozone in the sample directly on the LCD screen. ◆ using DPD method, high sensitivity, stable performance ◆ Wide dynamic linear detection, measurement range (0.05-2.00mg / L); ◆ analyze fast speed, just 3 minutes to complete the detection ◆ pulse power supply, low power consumption (a 9V battery can be used for more than 40 hours); ◆ LED silicon photo diode wavelength 510nm ◆ small size, light weight, easy to operate (the machine weighs 180g). ◆ automatic shutdown protection function