There are numerous theremin designs available today, currently produced or second hand. They differ by many criteria: prise, quality, age, popularity, more digital functions or pure analogue.
Etherwave theremin by Moog Music
https://www.moogmusic.com/synthesizers/etherwave-theremin/
The latest production of Moog Music continues a tradition from Etherwave standart.
Theremini by Moog Music
https://www.moogmusic.com/synthesizers/theremini/
This is a most accessible instrument. It combines basic principle of classical theremin with the features of digital technology, such as wave presets, pitch correction and MIDI connectivity
D-Lev d-lev.com
The D-Lev is a digital Theremin with many unique features. It allows you to create your own design and to program its functions up to your taste.
Open theremin
https://www.gaudi.ch/OpenTheremin/
A pocket theremin with very significant qualities of a classic theremin.
LV-4 PITCH AND VOLUME THEREMIN
Claravox by Moog Music (out of production)
Professional theremin combines great qualities of classical theremin with features of digital technology.
Etherwave Pro – most wanted professional theremin (out of production)
Etherwave Plus by Moog Music (out of production)
tVox tour (out of production)
