I let the salesman at the store talk me into buying this although I had low expectations.  I bought this for my 7 year old son for Christmas.  It was so incredibly useless.  I put it all back together immediately to return for a refund.  However, I had lost the receipt and I had paid cash.  So we still have it.  My son keeps getting it back out to try to play with it, but then he remembers it doesn't DO ANYTHING!  It is virtually impossible to get the slide to hold steady enough to see anything at all under the microscope.  It is uncomfortable to push the button to hold the light on while you're looking at the slide.  I understood that this was $20 and wouldn't work like an expensive microscope, but I'm telling you, this microscope is the same quality I would expect from a $1 microscope from the Dollar Store.  It is practically unusable because you can't hold it still and it's too hard to find your object under it.  My son plays with the little vial and the tweezers.  Was that worth $20?  No.  Trust me.  Do not waste your money on this.  You and your child will be disappointed.