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Introduction to Visibility

Thank you for visiting Optec Inc.'s visibility science division.

Optec has manufactured the LPV Transmissometer and the NGN Nephelometer for over 20 years. These instruments are used worldwide for the accurate measurement of atmospheric visibility in pristine and urban environments.

The subject of visibility is well documented in the literature over the last several decades. An excellent introduction to the subject of visibility can be found with the link below. Written by Dr. William Malm of the National Park Service, Introduction to Visibility explores all the aspects of the subject in a well written and generously illustrated e-book.

For those new to the subject, it is recommended that you review this document before examining our visibility measuring instruments in detail.

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