Resorts and live-aboards in the Maldives provide high quality and often the latest in diving equipment. All resort dive schools and live-aboard diving dhonis are equipped with compressors, tanks, regulators with octopus, BCDs, masks, fins and snorkels and other equipment such as dive computers, wetsuits, weights and weight belts.
The equipment is well maintained and stringent safety checks are regularly made. You may bring your own mask, fins and snorkel. If you wish to bring your own wetsuit a 3 mm full-length wetsuit or lycra suit is perfect for any time of the year. However some prefer a 5 mm wetsuit when doing more than one dive a day. Ocean temperatures rarely vary beyond 27 - 30 degrees Celsius. During hot periods water temperatures inside the lagoon increase measurably, and most divers are comfortable without a wetsuit during this period.
Note that under Maldivian diving laws all divers must have octopus regulators. Carry some spares just in case of a breakdown or shortage.