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Protrack II is the result of making our original design better than ever before!Through countless hours of development based on customer requests, customer feedback and LB Altimeter's renowned engineering, we present the only audible altimeter and digital freefall computer worthy to be called Protra..

Battery cover with air filter for PROTRACK II...

Two 3V CR2325 batteries are the long lasting power behind the many of the L&B altimeters. Order a pair today and order another to keep in your gearbag or logbook as a spare. These batteries can be used with Solo, Solo II, Optima, Optima II, Quattro, Viso or Viso II. Includes: 2 Renata CR 2325 3 ..