Portable UV Checker Atmospheric Light Meter
This UV meter detects both atmospheric UV-A and UV-B light (ranging from 400 nm to 280 nm) and displays the current unified atmospheric UV index of both UV-A and UV-B. UV-A and UV-B are the UV rays that penetrate the atmosphere. Students can relate this numerical index to our color changing UV beads or our light sensitive Print Papers observing how dark the color or how quick the change. Note: the meter is not sensitive to the rather narrow frequency of UV light emitted from artificial sources such as a UV flashlight or UV lamp. Meter requires a 3 volt CR2032 button battery (included). This meter works by calculating off both UV-A and UV-B rays. If using glass in an experiment, please note that UV-B cannot go through glass, so the meter cannot get a reading through glass and will just register a zero.   Meter comes with:  Belt clip carrying case,  Convenient lanyard to wear around your neck,  Button cell battery CR2032,  Complete instructions.Not for children under age 3 years: small parts: choking hazard