Refurbished Thermo Surveyor PDA Detector (available part numbers: SRVYR-PDA5 & SRVYR-PDA1) The Surveyor PDA Detector is a full-featured, time-programmable, photodiode array detector. Detection can be carried out in the full ultraviolet-visible range from 190 to 800 nm. Data can be taken in this range at a rate of up to 20 Hz with 20-bit digital conversion. Please contact us for complete Thermo PDA details.