Vernier is a technological device that increases the sensitivity of the measurement instrument, when subdivide the smaller division of it. On this simulator the vernier (rectangle below the scale) has twenty and five spaces between teh vertical lines. This means that it divides by 25 the dimension 0.025in (twenty and five micro inch) that is the smaller division of the scale.

- roll down the
**page**to**interact**with the**simulator of vernier scale,**

drag and drop the below scale,

we suggest before you go on, to familiarize with the concepts in the page

On this simulator, the vernier is the below scale, that slides under the main scale (fixed) that measures the greatness 'inch' in your decimal form (this means that the inch (1in) is divided in ten divisions (the spaces between the long marks - 0.1in) that are subdivided by four (the spaces between the short marks), making 40 divisions or 0.025in) -figure 1.

figure 1 - inch divided by ten (decimal or 0.1in) and subdivided by four (0.025in)

The vernier has twenty and five divisions, and because of that it divides the main scale by twenty and five (0.025in / 25 = 0.001in) [ | i i i | i i i | i i i | i i i | i i i | ]- figure 2.

figure 2 - vernier - to divide by twenty and five the smaller division of the main scale

If the zero mark of vernier aligns with one of the **bigger ** marks of the main scale

[...i | i i i **| ** i i i | i i ...] will give the tenths of the measure, direct reading! If it aligns with the first short mark[...i | **i ** i i | i ...], sum 0.025in the the decimal measure; (0.050 if aligns with the second [...i | i **i ** i | i ...] and 0.075 if aligns with the third [...i | i i **i ** | i ...] -multiply the number of marks by 0.025in) sum this result (milesimal part) with the integer part and with the decimal part.

The reading is very simple -figure 3. Observe if the zero (0) of vernier coincides with one of the marks of the main scale the reading is direct.

figure 3 - scale in thousandth inch with the smaller division subdivided by one vernier and vernier

If the zero of the vernier will be between two marks of the main scale, verify if the left mark is one subdivision (small mark - 0.025in) and multiply 0.025in by the number of small marks to the left, sum this number to the integer part, the tenths of inch and the value of the mark of the vernier that aligns (finally). In the example of -figure 3-

- the measure that we are measuring is bigger than 7in and smaller than 8in
- we measured 7in to start to teh sum

- the zero of the vernier swept by the third mark of the main scale
- 0.3in

- the zero of the vernier also swept the first small mark of the main scale
- 1 x 0.025in = 0.025in

- the sixth mark of the vernier aligned with the main scale
- 0.006in

- sum the values
- 7in + 0.3in + 0.025in + 0.006in = 7.331in

roll down the page and practice these knowledges in the simulator.

The resolution of the monitor doesn't allow 100% of accuracy in the 'alignment'.