stonegeek
Tutorial: How to use a millimeter gauge_pt5: How to read
Now to read:
The mark that tells you what the actual measurement is the long line on the bottom left (I've marked it with a red arrow). Then look up to the center part of the gauge and find a corresponding number. Some gauges are more accurate than others (depends on how they were calibrated). This might make measurements between gauges differ by .1mm or more.
Here it looks like it is almost on the 16mm mark/line. Depending on how accurate or annoying I want to be I can call this eye 16mm (what it was sold as) or I can get into a finner measurement.
Since the measuring line between the 15 and 16mm (or 1.5cm and 1.6cm) marks I know that it will be under 16mm and over 15mm. I also know that the measurement should be more than 15.5mm since it's so close to the 16mm line. This type of estimation is usefull as it allows me to double check further numbers.
The other lines/marks that follow the red arrowed line, the measuring line, show me the decimal place. They are 0.1mm increments.
To find which one, I look for the 0.1mm line (on the red arrow side) that matches up perfectly (or as close as possible) to a line with the numbers (in the center piece of the gauge). DO NOT LOOK AT THOSE NUMBERS IN THE CENTER. You only need the lines.
The line that matches up closely are the two lines that I've underlined in blue. Personally I think the 8th one is the best, but this can be up to some debate (between 8 and 9). These lines on the red arrow side tell you the 0.1mm increment of measurement, so count the lines (there are ten, with the .5mm mark being the center line that is not as short as the others. Its longer but not as long as the red arrow line.) and that tells you what the measurement is to the tenth decimal place.
So the measurement of this eye is 15.8mm in diameter or 16mm as eyes are usually sold in increments of 2mm.
If you wanted to read the inch size (why???) just look at the one mark on that size and find the closest measurement mark. Here it would be approximately 5/8inches. Again this is not as accurate. Look at all the spaces between the marks on the inch side.
Tutorial: How to use a millimeter gauge_pt5: How to read
Now to read:
The mark that tells you what the actual measurement is the long line on the bottom left (I've marked it with a red arrow). Then look up to the center part of the gauge and find a corresponding number. Some gauges are more accurate than others (depends on how they were calibrated). This might make measurements between gauges differ by .1mm or more.
Here it looks like it is almost on the 16mm mark/line. Depending on how accurate or annoying I want to be I can call this eye 16mm (what it was sold as) or I can get into a finner measurement.
Since the measuring line between the 15 and 16mm (or 1.5cm and 1.6cm) marks I know that it will be under 16mm and over 15mm. I also know that the measurement should be more than 15.5mm since it's so close to the 16mm line. This type of estimation is usefull as it allows me to double check further numbers.
The other lines/marks that follow the red arrowed line, the measuring line, show me the decimal place. They are 0.1mm increments.
To find which one, I look for the 0.1mm line (on the red arrow side) that matches up perfectly (or as close as possible) to a line with the numbers (in the center piece of the gauge). DO NOT LOOK AT THOSE NUMBERS IN THE CENTER. You only need the lines.
The line that matches up closely are the two lines that I've underlined in blue. Personally I think the 8th one is the best, but this can be up to some debate (between 8 and 9). These lines on the red arrow side tell you the 0.1mm increment of measurement, so count the lines (there are ten, with the .5mm mark being the center line that is not as short as the others. Its longer but not as long as the red arrow line.) and that tells you what the measurement is to the tenth decimal place.
So the measurement of this eye is 15.8mm in diameter or 16mm as eyes are usually sold in increments of 2mm.
If you wanted to read the inch size (why???) just look at the one mark on that size and find the closest measurement mark. Here it would be approximately 5/8inches. Again this is not as accurate. Look at all the spaces between the marks on the inch side.