5 Ampoules de 2 mL ,,4 components: 2-Methyl-1-butene [CAS:563-46-2] 4mg/kg 2-Methyl-2-butene [CAS:513-35-9] 36mg/kg Chloroform [CAS:67-66-3] 40mg/kg Tetrachloromethane [CAS:56-23-5] 20mg/kg in Dichloromethane ,,CRM, ISO 17034 and ISO 17025,, ,, 1 * 5 Ampoul