Opium Xceed Readings

Hello good afternoon ... this morning I measured the glucose levels.I click on a finger and the reading was 54. I understood that it was not good for what I proceeded to do it on another finger and made two readings ... ..87 and 117. Finally I did it in a third finger and the value was 102.
These differences in a meter and in different fingers are normal or something is not working well.How did I read the readings to put insulin?

Sorry.Where I said "and I did," I wanted to say and did.