The paired tows of vertical egg nets, referred to as PV in the CalCOFI database, was the replacement for the CALVET in 1982. The PAIROVET is a bongo-type version of the CALVET consisting of two nets instead of one. The frame was designed to facilitate comparison of nets constructed of various materials and to provide replicate observations when using similar nets.
The frame is constructed of 6061-T6 aluminum with stainless steel fittings. The nets are nylon mesh attached to the frame with adjustable stainless steel strapping. See CALVET for more info.