Formaldehyde

Box of Colorimetric Tubes.  171SB = 3 year, 171SA - 2 year, others are 1 year shelf life from date of manufacture.

710/710A/713 are 2x10 tubes per box.  Each sample uses 2 tubes. 10 samples total.

171SA/SB are 2x 5 tubes per box.  Each sample uses 2 tubes.  5 samples total.

171SC is 10 tubes per box.  Each sample uses 1 tube.  10 samples total.

710/710A/713/171SA/171SC must be stored in a refrigerated place (0-10°C/32-50°F).