APS Home > Data Sheets and Manuals Please Email us with any questions Select a model from one of the product categories below to access its data sheet and manual. SEARCH OUR WEBSITE Enter your search terms here: FLUXGATE MAGNETOMETERS -- Select a Model -- --Digital Output-- Model 113D Model 534D Model 539 Model 1540 --Miniature Units-- Model 533 Model 534 Model 535 Model 536 --Laboratory Units-- Model 428D Model 520/A --Portable Unit-- Model 428P --PC Board Level-- Model 113 Model 113D STEERING AND ORIENTATION SENSORS -- Select a Model -- -- Orientation -- Model 543 Model 544 -- Steering -- Model 547 Model 548 Model 571 Model 750 Model 751 Gamma Model 850 Model 851 Model 1150 -- Steering Sys -- Model 138 Model 175   MILLIAMMETERS -- Select a Model -- Model 428D Model 428P DC SQUID MAGNETOMETERS -- Select a Model -- Model 581 Model 2G755 Model 2G760