Why are there so many different screw sizes?!

So I've taken apart my iPhone 6 plus several times trying to fix numerous problems due to juice spill. Some screws got lost, and I didn't keep track of which ones go where. I ordered new set of screws. I bought electric calipers to measure each screw. The problem is there are so many different measurements. I'm trying to find a 2.2mm needed and I've got a 2, 2.1, 2.26, 2.33, 2.35, and 2.3. I have measured them all several times. Do I round up? I've seen charts for all other iPhone models. But none for the 6 plus. I would pay to download a chart for specific measurements and locations. I just want to get this thing back together to see if I've fixed all my problems! Help please!

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