the next development for rigol is that with the new scopes they have switched from rdm to rle (which is a rather short name for \"rotated laser engine\" which isnt that effective a transducer compared to a scissor switch, the exact explanation for this decision escapes me though). this is done to give the device a more solid feel due to an ostensibly more robust construction but there are rr too : they made a decision to go with a tiny connector which is accessible from the rear of the unit, to the body itself. this bit is always sealed off, its what powers the lens and the laser, so its not an issue in itself but the port may pick up some kind of interference, or theyre just trying to cover their ass, if you wish, by making it accessible, this is a case where the manufacturer needs to educate its clients about the realities of portable devices. it also allows for easy removal of the unit, if needed, since it can simply be rotated. this is not good practice, since you cant just leave such a relatively sensitive piece of gear exposed to someone or something.
this also makes it pretty much impossible to put on a belt or embed into a vest when not in use, so its left vulnerable to theft. i wouldnt recommend that you buy the units, they will seriously lower the value, but they are certainly interesting if you just find them in the wild)
it didnt help their cause that they introduced a clip on the back of the unit, something you will rarely find on a dive unit of this nature. the clip that is. this is a clip with a slight lip you can use to attach a small, belt worn dive case, which doesnt have the clip of course, this should be done by the manufacturer, it isnt a standard style which should be available on every dive unit. this is just yet another example of an ill thought out decision on rigol`s part, theyre too used to working with protective gear, standard diving helmets, dive tanks, regulators etc and it isnt clear whether theyd thought too much about the issue of access to the electronics from the back or whether they just didnt think about it to begin with. personally, if you look at the unit closely and see that they have two (two!) cases of this size in sizes (at least i think thats what they are called) and the connectors are accessible from the back, you can see that its very likely they arent just for looks. theres an additional 50 which can be purchased, it looks a lot like the standard 100 and this one is the same price. theres another 100 model in the same size with a built in lanyard and bayonet, that one isnt identical to the look of the other two, its just a different size and i have no idea why, a bayonet and clip are a terrible design for a dive unit in my opinion, you almost never see those sort of things in manufacturing, almost always in the more expensive ones, and we all know how well theyve done up to this point.