Monitor critical UV radiation. This portable, hand-held meter measures the UV photon flux in the wavelength range of 250 and 400 nanometers in units of
µmol m^-2 s^-1 (micromoles of photons per square meter per second).

High levels of UV light can be detrimental to plants. Use this meter to determine the UV filtering capacity of greenhouse shades and glass barriers. Includes one 9-volt battery. Now also available with external sensor on 2-meter cable.