4+7(0 01 )- Mitutoyo Figure 6 (c) Measure thickness (t) of a plate using a micrometer. t = mm. The least count of instrument scale for micrometer is: 2. The length of an object is measured using 3 different instruments, 3 values of 1.42 cm, 1.420 cm and 1.4200 cm are obtained respectively. (a) What are the essential differences among the 3 measured values? (b) Write down the names of the three instruments