MES Generation Number Recognition Pictures & Info (Digital Units) I got these Pictures together in the hopes of helping people to be able to tell the various MES Generations apart, when buying or discussing the MES units. A lot of people ask, “Which is the best one, How can I tell which one is which, etc, etc”. This Thread should help with the identification of the MES Units. For my Thoughts & Findings on the various Generations, and which I consider the best, go to: Masterbuilt Smokers (Bear's Thoughts & Findings) Hope this helps, Bear Note: I sold my MES 30, so I will have to use internet Pics for the MES 30: This is an Early model of the Gen #1 MES 30 (Note the square corners on the Control Box on top). The Top Vent is on the back right corner of the Top. The door is hinged on the right side: This is the inside of a Gen #1 MES 30. Note the Large Water Pan. The AMNPS was designed specifically to fit on the support rods to the left of the Chip burner assembly: Here are 2 MES 40 units. The one on the Right is a Gen #1. The one on the Left is a Gen #2: Note the Window in the Gen #2 is larger than to Window in the Gen #1: This is the top of a Newer MES 40 Gen #1. Notice the rounded corners on the Control Box on top: The top Vent is on the back right corner of the top: This is the inside of the MES 40 Gen #1. The Water Pan is nearly full width. Note the Aluminum plate setting on the right side of the Water Pan. I use that to push heat from the right to the left in the Smoker. This is needed because the heat comes from the bottom right, & the top vent is in the back right corner of the top. Without the Heat deflector the heat rises from the heating element, and goes directly to the Top Vent, and out: This is an MES 40 Gen #2. Note the Controls are built into the front of the top of the Smoker: Inside of the MES 40 Gen #2. Note the Slanted Drip Plate, higher on the Right, with a hole on the left end for a small Water Pan. I removed the small water pan & put a foil pan under the hole. Then I can set my AMNPS over the hole in the Drip Plate: The Top Vent on a Gen #2 MES is on the Left side wall, instead of in the top: Generation #2.5 MES 40. The strap is just to keep it from blowing over in a strong wind. The Door is the same as the door on the Gen #2: Inside of the MES 40 Gen #2.5. Note the Split level Water Pan (Deeper left side than right side). Note: I have since found the right side of the bottom rack to be a better place for the Amazing Smoker: (In the Gen #2.5) Top of the MES 40 Gen #2.5. Note the top vent has been moved to the back left corner of the top. Closeup of the Control panel of the MES 40 Gen #2.5. Note the Sun shield that snaps on to reduce sun glare on the panel.