okay this is going to be a little bit of an introduction to reading a dial caliper so we're going to be talking about the dial caliper that we're going to be using in this class these devices are very useful because we can use them to measure both outside diameters of items inside diameters and we can also measure depth with them they'll measure up to six inches and we can do this to the nearest thousandth of an inch when we are dealing with engine parts and car parts in general we want to be able to measure to the nearest thousandth of an inch it's a very important thing to be able to do so i'm going to take you through the process of reading a measurement from the style caliper starting with the basics and then working our way up from there if we look at the first example in our activity you'll see that there's basically three places that we read the caliper measurement from and i have these color coded for our first example so the first thing that we read on our dial caliper is the number of whole inches the maximum number of whole inches that are uncovered in this case the maximum number of whole inches uncovered which is highlighted in red is one inch so the first part of our measurement would be one inch or 1.000 inches the second part of our measurement is the number of 100 thousandths lines that are uncovered we have those 100 thousandths lines highlighted in green we can see that there are three 100 thousandths lines uncovered in this case because there's three lines highlighted in green so we would have to add to our measurement 300 thousandths the last thing that you'll notice is that we have the blue line which is pointing to the number of thousands that's what we read on the dial what the dial and our vernier caliper allows us to be able to do is to read between the lines that's something we can't do with a standard ruler is read the measurement between the lines when we are reading a measurement with a standard ruler and it falls between lines what we tend to do is we just round to the nearest line by being able to do this with our vernier caliper with having a dial we were able to actually read the measurement between those lines so we can read between those 100 000 lines and we can see that we are reading on the dial a measurement of 15 thousandths of an inch so when we put these three numbers together we end up with a measurement of 1.315 inches so our measurement would be 1.315 in this case so together 1.315 let's look at another example together so again in this example we're going to look at the number of whole inches uncovered well how many whole inches do you see uncovered if i look at my dial you'll see that i have two whole inches uncovered i have not uncovered the three yet so my maximum number of whole inches is two or two point zero zero zero which is the way i'm going to record this below i'm going to change the color of my text so you can see this more clearly and i have a measurement of 2.000 why is that important it's important because if i just wrote two i don't know the accuracy of my measurement by writing 2.000 that is indicating that i have measuring exactly two inches to the nearest thousandth of an inch it is important that all of our measurements be to the nearest thousandth of an inch in terms of this activity and in terms of when we're measuring engine parts down the road we will get into some more precision stuff not necessarily in this class where we will actually measure to the nearest 10 000 of an inch so the next thing we need to look at is how many hundred thousands lines do we have uncovered past the two well if we count the lines we could see that we have one two three lines uncovered so that's three hundred thousands past the two so we're gonna write that measurement as point i'm sorry i'll add the zero so zero point three zero zero three hundred thousandths from there and we will make that red and then lastly how many one thousands lines are uncovered well we have to read the dial to determine that and the dial shows us that we are reading 65 000 of an inch not .65 but rather .065 be careful with that so we're going to write this as .065 and i will highlight this in red now in order to get our total measurement what we need to do is we need to add up all of these numbers so i'm going to switch my font color again to red so you can see this more clearly and i'm going to add my numbers together i have 2.000 or 2 inches plus 0.300 or 300 000 of an inch plus 0.06 or 65 thousandths of an inch when i add all of those together i end up with 2.365 and that is my total measurement that i am reading on my calc for each of the following measurements what i would like you to do is to set your caliper to whatever is being measured on the screen so i'm going to take my caliper and i'm going to adjust it to what i see on the number five example so i'm going to go ahead and i'm going to move my caliper until i'm reading exactly what it's seeing there so my caliper now matches what i see on my image let's go ahead and read that oh there's three things that we need to read we need to read the number of whole inches first the number of whole inches maximum number of whole inches uncovered is 2.00 and we need to look at the number of hundred thousandths lines that are uncovered to the right of the 2.000 well there's one two three lines uncovered i can see the number four but the key here is the line is not uncovered so i'm going to add 0.300 or 300 thousandths lastly i want to read the number on the dial which is a little tough to see here there's a little bit of a glare but that's looking to me like twelve thousandths or point zero one two add those numbers together and we end up with a measurement of two point three one two we'll go through and work on the rest of these and this will give you an idea of measuring reading the dial caliper and measuring to the nearest hundred thousand i'm sorry to the nearest thousandth of an inch thank you everybody 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