Section 27. The certificate of inspection issued by the division, or by an insurance company, shall state the name of the owner or user, the location, size and number of the boiler, the date of inspection and the maximum pressure at which it may be operated, with the signature of the inspector, and shall contain such extracts from the statutes as shall be deemed necessary by the board. It shall be so placed in the engine or boiler room of the plant where the boiler is located as to be easily read, except that the certificate of inspection for a portable boiler shall be kept with it and shall be always accessible.