How to find least count of any measuring apparatus.

Vernier caliper 

How to find least count?

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💡 What is Least Count?

Least Count (L.C.) is the smallest measurement that an instrument can read accurately.
It tells you the precision of the instrument — basically, how fine a measurement it can take.

🧠 Think of it as:

"How small can this device measure?"

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🔍 How to Find Least Count of Any Apparatus?

There’s a universal formula:

Least Count = Value of One Main Scale Division / Number of Divisions on the Vernier or Dial Scale

But depending on the instrument, the method varies. Here's how you do it for common tools:

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1. Ruler / Scale (Meter Scale)

Each division = 1 mm = 0.1 cm
➡️ L.C. = 0.1 cm

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2. Vernier Caliper

✅ Formula:

L.C. = 1 MSD - 1 VSD
(Or simply: L.C. = Smallest reading on main scale / number of vernier divisions)

📌 Example:

• 1 cm = 10 divisions → 1 MSD = 1 mm
• Vernier has 10 divisions = 9 mm
  ➡️ L.C. = 1 mm – 0.9 mm = 0.1 mm

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3. Screw Gauge / Micrometer

✅ Formula:

L.C. = Pitch / Number of divisions on circular scale

📌 Example:

• Pitch = 1 mm (one full rotation moves the spindle 1 mm)
• Circular scale = 100 divisions
  ➡️ L.C. = 1 mm / 100 = 0.01 mm

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4. Stopwatch / Analog Timer

Check the smallest time interval it shows — usually:
➡️ 0.1 sec or 0.01 sec

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⚠️ Note:

The smaller the least count, the more precise the instrument is. But don’t confuse accuracy with precision — that's another beast.