Which of the following length measured is more accurate and why i) 500.0cm ii) 0.0005 cm iii) 6.00 cm

Question :  Which of the following length measured is more accurate and why 

i) 500.0cm

ii) 0.0005 cm

iii)6.00 cm

Doubt by Anushka

Solution : 

500.0 cm has a least count of 0.1 cm 
0.0005 cm has a least count of 0.0001 cm
6.00 cm has a least count of 0.01 cm 

Clearly, 0.0005 has the lowest least count. 
Lower the least count, higher will be the accuracy. So ii) 0.0005 cm is the most accurate measurement.