A small, inexpensive and compact magnifier for pest and beneficial insect/mite identification. Magnification is 30 x 21mm. Overall dimensions: 2.5 x 3.5 cm. Solid construction, made out of metal and glass. Comes with a lanyard, allowing you to hang the magnifier around your neck and keep your hands free while working or scouting the crop.  

Commonly referred to as a jeweller's loupe, or compact magnifying glass.