Girlanda refers to a string of sensors placed at different depths.

..., a także girlandę czujników przewodności elektrycznej, temperatury i ciśnienia (CTD) zawieszonych w toni (na głębokościach 4, 8 i 16 m pod powierzchnią wody).
http://portalgis.gdansk.rdos.gov.pl/morskafarmawiatrowa-Balt...

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The Decagon CTD sensor is a low-cost, accurate tool
for monitoring water level, electrical conductivity,
and temperature in both groundwater and surface
water. The sensor employs a precision pressure
transducer to sense water levels between 0 and 3.5
meters. The sensor cable is vented to remove the
effects of barometric pressure changes. The
integrated 4-probe electrical conductivity transducer
accurately senses EC up to 120 mS/cm. The sensor
also features an precision thermistor to measure
temperature. The CTD has a compact 3.4 cm
diameter body made of rugged Delrin. The electronic
circuitry is encapsulated in a marine-grade epoxy to
protect the sensor in corrosive environments.
https://www.metergroup.co.jp/product/pdf/CTD Integrators Gui...


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The Conductivity, Temperature, and Depth (CTD) sensor is one of the most used instruments in the Oceanographic field.
https://www.researchgate.net/publication/261063976_Inexpensi...