WHICH JUICERS?  This is a comparison between available juicers on this site

Stainless manual larger capacity BL-30 B
Much larger worm wheel (auger) and barrel, that is extra efficient and can do most things the electric juicers can do, a pleasure to use, as it pulls in the grass
and does every thing you would expect from a good quality hand juicer, including homogenising, blank plate supplied. Grade 304 st/steel. 
5 years warranty all parts. This enhanced version has extra strainers compared to basic BL-30 sold elsewhere.
The unit is excellent for grass and all leafy greens, parsley, apples, celery, etc, but is less efficient 
with hard root vegetables like carrots which must be cut length wise in strips, pulp is not as dry as LexSun and Kempo for hard vegetables.

200 mg of wheatgrass gave us approx 126ml of juice, results can vary slightly from juicer to juicer, close to electric juicers. 5 years warranty.
The best and most important general purpose survival tool one could have in difficult circumstances, as it can juice all natural grasses and herbs commonly
found over most of the world.
Few people know that the best way to build maximum immunity to massive electromagnetic radiation from microwaves (mobile phones), electrical equipment
(computers) and potential nuclear fallout that can be blown towards us from other parts of the world, is to eat and drink more GREEN, it also increases
resistance to disease generally.

Electric LexSun Juicer (Auger type extraction, simulated cold press action) 200 mg of wheatgrass gave us approx 127ml of juice.
100 watt, triturating action (simulated cold press action) that does less damage to the fibres due to lower speed and worm wheel press action. Consumer friendly,
few parts too clean. Leaves more antioxidants in the juice. The actual worm wheel (auger) is made out of nylon.

Kempo Juicer ( also sold as Hippocrates )  with 2 sets of st/steel gears, 100 Watts, but geared to increase power to 1/4 HP,
triturating action as above, this juicer has been found to be very efficient and performs well. 10 years warranty on motor and body!  
Does consist of extra moving parts than above model.