Gastec Hydrocarbons Gas Detector Tubes. Options:

Hydrocarbons Detector Tubes (Lower Class)
Detection Range: 0.0375-1.8%
9 detector tubes, 1 pre tube per box
P/N 103

Hydrocarbons Detector Tubes (Higher Class)
Detection Range: 100-3000 ppm
10 tubes, 10 tests per box
P/N 105