Sea-Tech [now Wet Labs] Transmissometer - underwater optical transmitter/receiver unit -- this unit has an app. 25 to 26 cm path length between the sender and receiver -- used in fresh or sea water environments, this is an instrument designed to measure optical attenuation, to determine turbidity or concentration of particulate matter in water -- -- this unit has a deep sea heavy duty plastic housing -- measures app. 4 by 32 in. including the 'nipple' --
-- likely unused/undeployed in the water but spent time at sea -- some light wear from storage most especially to the zinc corrosion inhibitors --
-- *online info: "SeaTech manufactured a range of transmissometers to measure optical attenuance, usually (but not exclusively) at red (660nm) light wavelengths. Path lengths varied from 5cm for use in turbid waters to 1m for use in the clear deep ocean"* --
-- we currently are listing several oceanographic instruments --
Each week we post a number of interesting items that have been purchased from Oregon Estate Sales