Type SO-zz-001  10 to 1000 ppm O2
  Type SO-zz-010  0.01 to 1.0% O2
  Type SO-zz-020  0.01 to 2.0% O2
  Type SO-zz-050  0.05 to 5.0% O2
  Type SO-zz-250  0.1 to 25.0% O2
  Type SO-zz-960  1.0 to 96.0% O2

 SO-A0-xxx  TO 39  9.2 ∅ * 6.4 mm 
  SO-B0-xxx  TO 8  15.3 ∅ * 13.7 mm
  SO-B1-xxx  TO8 with mounting flange
  SO-D0-xxx  Screw mounted housing
  SO-D1-xxx  Screw mounted housing
  SO-E1-xxx  TO8 with hose connection