I saw one of these being used in one of my favourite cocktails bars in Brixton a few months ago and had to get one for myself. It essence it is like an oversized garlic crusher, where put half a lime in the bowl-side face up, and then as you pull the levers together the lime is turned inside-out and getting all the juice out with ease.
No more turning and squeezing that lemon time and time again on an traditional citrus press, nope – it is just a single squeeze with the “mexican elbows”. And all for under a tenner. This one may be designed mostly for squeezing lemons, but I have had no trouble with limes and oranges in there either.