You know, thinking on it, you might just want to get the 6x18 Zeiss. It has an a 3mm exit pupil (which is big for a mini-monocular) only weighs 2 ounces, has usable eye relief, excellent optics, and is available. It's cons are: it's not waterproof, it is made of plastic, and it has a sliding focus. After saying that, it's "cons" are done well and it is still a quality piece. To get metal, waterproof, mechanical focus, small quality, = the Leica's, is about $150 more. It's all what your priorities are. Those mini-Nikon monoculars are still available (at least on Ebay) and are about the same money as the Zeiss. The Nikon5x15D HG is still sold in the U.S. on Amazon, and the 7x15D HG I only found on Ebay in Japan. The thing with the Nikons is that they are extremely small and very easy to carry. The 5x model was the more popular because it had longer eye relief, wider field of view, and It wow'd people more to look through. From what you originally asked it is probably the closest thing to what you are looking for but more difficult to get. The Doctor-Noblex one is okay at a third of the price but is also a third of the unit of the Zeiss or Nikon and even less than that compared to the Leica. Something so small that you always don't mind carrying it, and it's worth carrying, is the trick. If you are willing to carry one that weighs over 8 ounces there are a lot of low priced 8x30 and bigger units. Everybody around AGN says pcp airguns are a rabbithole to fall into but optics, watches and knives are just as bad. If you just want to get a cheapie throw-away while trying to decide if the search is really worth it to you, go Bushnell. Bushnell makes the best of the cheapies by far.
I have very limited experience with monos, but I think we're on the same page. The major difference I saw was what you described. I found it harder to scan the area with the mono. l also have a Nikon 6x20 rangefinder. If don't want to carry the binoculars, the range finder doesn't take up much space and gives me a monocular and of course, a rangefinder. I've quite looking for a monocular.
I've been using a Hawke 8X42mm Monocular Endurance model ..Any power beyond 8x is going to be shaky and hard to hold still and less of a field of view .42mm objective lens gathers lots of light for a bright image .This monocular can be used with one hand easily and the focus dial is within reach of your thumb or index finger.I can sight in on small game faster with this monocular than binoculars. Lightweight can handle on a lanyard on your neck and not be cumbersome. You can use it both eyes open just like some people shoot through scopes.This monocular sells for $118 to $125 on Amazon.
