Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Useless junk

We have a toy microscope made in America in the 1950s that still works but we figured after 60 years of technological advancements a 2012 microscope would be far superior. That assumption could not have been more erroneous! This microscope is junk. The viewer screen produces a dim, fuzzy picture which one could outdo with a cheap magnifying glass. The microscope fails to produce a sharp image on any of the three settings. The focusing knob's best result is lost once you let go of the knob and that "best result" is awful to begin with. The only feature that works as advertised is the on/off switch and I recommend you leave it "off" and save a lot of aggravation.