42 Software research, testing, creation, design, development, implementation, programming, customisation, updating, repair and maintenance; hosting services, namely, storing electronic data for others; software as a service services featuring software for automating email communications, automating appointment scheduling, invoicing, reporting, collaboration, customer relations management, customer data management, and computer data backup, all in the fields of exhaust gas engineering, plumbing, and heating engineering; software as a service services featuring software for controlling, communicating with, reporting of data from, retrieving data from, and viewing data from, portable gas measuring and analysing devices and probes therefor; software as a service services featuring software for controlling, communicating with, reporting of data from, retrieving data from, and viewing data from, portable gas measuring and analysing devices, namely, carbon monoxide, airflow, temperature, and humidity detectors; rental of software; advisory, consultancy, design and updating services relating to computer hardware and software; providing a website featuring information relating to computer hardware and software; computer programming; rental and leasing of computer hardware and software