Hydrogen sulphide (H2S)

Box of Colorimetric Tubes.  120SH/SF/SC/SB/SD/UT/UH = 3 year, 120SM/SE/U = 2 year shelf life from date of manufacture.

120UT is 5 tubes per box.  Each sample uses 1 tube. 5 samples total.

Others are 10 tubes per box.  Each sample uses 1 tube. 10 samples total.