An important and unique feature of the NERD 2 dive computer is that it requires a mount to keep it properly positioned. The NERD 2 is packaged with either a mount option for a closed circuit rebreather or open circuit regulator. This is an OC regulator mount, suitable with most regulators. The mount diameter is adjustable to { 0.67 - 0.83 in | 17 - 22 mm }.