The least counts of two instruments are LC₁ = 0.02 mm and LC₂ = 0.005 mm. Which statements are correct?

Select all that apply

• Option A

  Instrument 2 has four times finer resolution than instrument 1.

• Option B

  For a 1.00 mm measurement, one-LC fractional uncertainty is 2% for instrument 1.

• Option C

  For a 1.00 mm measurement, one-LC fractional uncertainty is 0.5% for instrument 2.

• Option D

  A smaller least count always guarantees absence of systematic error.