
Background Luminance Sensor LM21
The Background Luminance Sensor LM21 is a precision photometer with a verified photopic spectral response.
LT31
By measuring light attenuation (reduction in light) between the transmitter and receiver, the LT31 is thus independent of the type of visibility reducing particles present — ensuring the best accuracy in the most crucial low-visibility situations, and in all conditions.
Other benefits include:

The features that make the LT31 transmissometer the gold standard:


The Background Luminance Sensor LM21 is a precision photometer with a verified photopic spectral response.

FD70 is powerful technology that can potentially replace many separate sensors such as your visibility and present weather sensor, rain gauge…

Vaisala Present Weather and Visibility Sensors PWD series deliver a mix of meteorological optical range (MOR), characterization of reduced…
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