What does “Least count and instrument reading” actually mean in Experimental Skills, and why does it matter for NEET?
An instrument cannot honestly resolve changes smaller than its least count. A final reading combines the main-scale reading, coinciding-division contribution, and the zero-error correction with correct sign.
In simple words: An instrument cannot honestly resolve changes smaller than its least count. A final reading combines the main-scale reading, coinciding-division contribution, and the zero-error correction with correct sign. Getting Least count and instrument reading clear matters because NEET questions on Experimental Skills usually test this idea directly, not just a formula you memorised.
Key point
Least count and instrument reading
Common mistake
adding a positive zero error instead of subtracting it from the observed reading.
Memory tip
correct reading = observed reading - zero error.
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