Dremel 2050-15 Stylo+
Uses a small plug in power supply and have far less torque than the larger rotary tools. Fits in my big hand like a large pen and that is how I hold it for fine work.
Collets are standard but will readily take a small three jaw chuck. The cheap Asian 3 jaw chucks are just that, cheap. Get a genuine Dremel 3 jaw chuck. I read somewhere that these are made in Germany and are made of steel; at least the ones I have bought recently are. The inexpensive Asian variety are made of aluminum and fit and runout are not always that great.
Another option, sometimes less expensive but sometime more expensive are what are called "Nail Drills". Search Amazon for a selection. Can be very inexpensive, sometimes quite expensive, sometimes corded, sometimes rechargeable. All, at least those I have looked at, have a 3/32 ( 2.35mm ) collet and use burrs having shanks of that size. This is a common size for jewellers tools and you can get very good quality burrs and drills having this size shank.
Foredom, and others, have a line of rotaty tools called Micro Motor tools
https://www.foredom.net/product-category/micromotors/micromotor-kits/These are very similar in design to the above mentioned "Nail Drills" and are available in brushless and non-brushless styles. Being Foredom they are expensive.
I am going to have a look at the "Nail Drills" again and will likely get one to try, can't enough tools
I do like my Dremel Stylo+ however, especially with the genuine Dremel three jaw chuck.
Nothing ventured, nothing gained.
cheers, Graham