9.4.9. The working chamber shall contain a portable gauge to indicate pressure and a thermometer. Both shall be placed not further than 3 m from the working face. A gauge indicating the air pressure in the decompression lock shall be placed on the partition separating the working chamber from the air lock.
R.R.Q., 1981, c. S-2.1, r. 6, s. 9.4.9.