Model 108-10.0/10.6 offers both 10.0 and 10.6 eV potential, has a 0.781″ base diameter, and is used in Tracor, OI, and Baseline instruments. Model 103 has a 1.375″ base and is used in HNU and SRI detectors. Model 108-BTEX lamp’s higher output makes it ideal for detection of BTEX compounds.