Our highly sensitive MiniMAX X4 gas and carbon monoxide detector is an unsurpassed portable gas detector for protection against flammable, oxygen, carbon monoxide and hydrogen sulfide gas hazards…. The MiniMAX X4 focuses on ease of use by offering only the functionality required to comply with legislation. Everything that a user ROUTINELY HAS TO DO can be achieved with a single button press! Keeping it simple reduces training requirements and enables use in a wider range of industries.