Nitrogen dioxide

Box of Colorimetric Tubes.  117SA = 3 year, 117SD = 1.5 year, 117SB = 1 year shelf life from date of manufacture.

117SA/SB are 10 tubes per box.  Each sample uses 1 tube. 10 samples total.

117SD is 2x 5 tubes per box.  Each sample uses 2 tubes. 5 samples total.