The 2012 upgrade kit contains 4 new items that are standard on all rEvo rebreathers. Features 1.The rEvo checklist: the use of a check lists during your rEvo courses was already required for some time now. To make your checks even easier, we produced a double sided laser engraved checklist. One side contains the _closed check_ and the other side contains the _pre-jump check_ Details on the content of the checklist can be downloaded from the website. The checklist comes with a bolt-snap, so it can stay together with your unit. 2 _TOP marker_ To assure that divers don_t make errors when exchanging scrubbers, a marker is added on top of the canister on the exhale lung, indicating that that canister is placed on _TOP_ position in the rebreather When after a dive, you want to exchange one scrubber, (cycle), follow exactly this procedure: If you make it a habit to immediately empty a canister when you have removed the _TOPMARKER_, you will not make a mistake when exchanging/filling/replacing canisters. So: _Take the top canister, with the _TOP-MARKER_ out of your rebreather _Unscrew the _TOP-MARKER_ from the canister and immediately empty that canister. (you are now sure you emptied the exhausted canister) _Screw the _TOP-MARKER_ on the remaining (full) canister, and either put that canister in the upper position of the unit, or if you are finished diving, in a sealed container or plastic bag. _Fill up the empty canister, and put it in the lower position of the rebreather, or in a sealed container if you finished diving 5 _Fill in your log that you refilled the bottom canister with fresh sorb 3 Injection molded sensor tray The new injection molded sensor tray allows fitting and removing of 5 sensors without unclipping any part: installing of a sensor is now simply fitting the screw on the sensor, and pushing it onto the tray. The new tray also allows fitting of all rMS components. 4 Canister mesh with rubber molded edge Was designed to avoid metal wires sticking out of the side of the canister mesh, and to make filling/tapping of the canisters easier, a triangle-shaped rubber edge is molded on the mesh that closes of the top of each canister. This upgrade kit is 30% less then buying all items individually!