10 Difference Between Vernier Caliper And Micrometer Screw Gauge

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Vernier Caliper

Vernier caliper And Some Of Its Parts

Vernier calipers, like micrometers are the tools more commonly used for low tolerance measuring. Low tolerance measuring tools provide very accurate measurements with a small margin for error.

Vernier Caliper was invented by French mathematician Pierre Vernier in 1631. It is an instrument that precisely measures internal or external dimensions and distances. It is also very useful instrument to use when measuring the diameter of a round objects like cylinders or dimensions between two point in a straight line. Most verniers are capable of measuring outside dimensions, inside dimensions and depth. Some calipers which incorporate quadric feature can also be used to take step measurements.

The Vernier calipers have both a fixed scale and a moving vernier scale. Other parts of the Vernier Caliper include: External jaws, Internal jaws, fixed jaws, sliding jaws, fixed scale and locking screw. The main scale is graduated in either millimeters or tenths of an inch. Three types of Vernier Caliper include:

  • Analog Vernier Caliper
  • Digital Vernier Caliper
  • Dial Vernier Caliper.

Micrometer Screw Gauge

Micrometer Screw Gauge

The micrometer screw gauge was invented by William Gascoingne in the 17th century as an enhancement of the venier. It was used in a telescope to measure angular distances between stars and the relative sizes of celestial objects.

A micrometer screw gauge also referred to as micrometer is used for measuring dimensions smaller than those measured by the vernier caliper. Similar to vernier calipers, a micrometer is made up of two scales, that is, the main scale and an auxiliary scale. The main scale is a millimeter scale graduated to 0.5 mm, while the auxiliary scale is divided into 50 equal dimensions. The auxiliary scale is on the thimble of the screw gauge and measures hundredth of the measurements. Other Parts of a micrometer screw gauge include: C-Frame, Anvil, Spindle, Sleeve, Thimble and Ratchet.

Most micrometers have a flat anvil which restricts measurement only for outside diameter and thickness. There are two types of micrometer screw gauge, that is, external micrometer and digital micrometer.

Both Vernier caliper and micrometer screw gauge might have zero error to some extent. However, the zero error can be calculated and removed. More importantly, both can be used in the various field, they are used in woodworking, engineering and mechanical fields as well.

What You Need To Know About Vernier Caliper

  1. Vernier Caliper is a gun-like instrument.
  2. Three types of Vernier Caliper include: Analog Vernier Caliper, Digital Vernier Caliper and Dial Vernier Caliper.
  3. Calipers are not capable of taking small measurements. The least count of the Vernier calipers ranges from 0.1 mm to 0.02 mm.
  4. Vernier Calipers have a wide range of measurement.
  5. Vernier Calipers provide a less accurate measurement when compared to micrometer screw gauge.
  6. Vernier Calipers have special type of jaws that can take both internal and external measurements accurately.
  7. Calipers have a sliding scale within which measurements are taken.
  8. Calipers are less expensive than micrometers. The price of Vernier calipers starts from as low as $ 20 to $100.
  9. Parts of the Vernier Caliper include: External jaws, Internal jaws, fixed jaws, sliding jaws, fixed scale and locking screw.
  10. Because of the ability to measure relatively large dimensions calipers are widely used in mechanical engineering, and in various industries such as medicine, construction, metalworking, woodworking etc.

What You Need To Know About Micrometer Screw Gauge

  1. Micrometer Screw gauge is an axe-like instrument.
  2. The two types of micrometer screw gauge include: external micrometer and digital micrometer.
  3. Micrometers are capable of taking small measurements. The least count of micrometers ranges from 0.01 mm to 0.0001 mm.
  4. The measurement range of a micrometer screw gauge is 25 mm.
  5. Micrometer screw gauge provides a more accurate measurement when compared to Vernier caliper.
  6. Micrometer screw gauge is used for taking external measurements only as it does not have appropriate structure for taking the inner measurements of the object.
  7. Micrometers have a rotating scale within which measurements are taken.
  8. Micrometers are expensive than the calipers. The price of a micrometer screw gauge starts from $50 to $200.
  9. Parts of a micrometer screw gauge include: C-Frame, Anvil, Spindle, Sleeve, Thimble and Ratchet.
  10. Because of the ability to measure small dimensions micrometer screw gauge are widely used in mechanical engineering especially engine building and in various industries such as medicine, construction, metalworking, home use and school use.

Difference Between Vernier Caliper And Micrometer Screw Gauge In Tabular Form

BASIS OF COMPARISON   VERNIER CALIPER MICROMETER SCREW GUAGE
Description Vernier Caliper is a gun-like instrument. Micrometer Screw gauge is an axe-like instrument.  
Types Analog Vernier Caliper  Digital Vernier Caliper Dial Vernier Caliper.   External micrometer Digital micrometer.
Least Count The least count of the Vernier calipers ranges from 0.1 mm to 0.02 mm.   The least count of micrometers ranges from 0.01 mm to 0.0001 mm.  
Measurement They have a wide range of measurement.   The measurement range of a micrometer screw gauge is 25 mm.  
Precision They provide a less accurate measurement when compared to micrometer screw gauge.   They provide a more accurate measurement when compared to Vernier caliper.  
Scope Of Measurement It has special type of jaws that can take both internal and external measurements accurately.   It is used for taking external measurements only as it does not have appropriate structure for taking the inner measurements of the object.  
Scale Have a sliding scale within which measurements are taken.   Have a rotating scale within which measurements are taken.  
Price They are less expensive than micrometers. The price of Vernier calipers starts from as low as $ 20 to $100.   They are expensive than the calipers. The price of a micrometer screw gauge starts from $50 to $200.  
Parts Parts of the Vernier Caliper include:  External jaws  Internal jaws Fixed jaws Sliding jaws Fixed scale Locking screw.   Parts of a micrometer include: C-Frame Anvil Spindle Sleeve Thimble  Ratchet.  
Application Mechanical engineering   Construction Metalworking woodworking Mechanical engineering & industries such as:  Medicine Construction Metalworking Home use School use.  

What Are Some Of The Similarities Between Vernier Caliper And Micrometer Screw Gauge?

  • Both Vernier calipers and Micrometer screw gauge are used in fields such as engineering, metalworking, woodworking etc.
  • Both are simple to use and easy for measurement.
  •  Both Vernier caliper and micrometer screw gauge might have zero error to some extent. However, the zero error can be calculated and removed.
  • Both have ability to measure small dimensions. However, in this regard, they only differ in terms of precision.
  • Both micrometer screw gauge and Vernier calipers use the amplification principle of the main scale (the scale is amplified in such a way into small dimensions).
  • Both Vernier Calipers and Micrometer screw gauge are available in digital forms.
  • Both micrometer screw gauge and Vernier Calipers have two scales in which one is movable and the other is fixed.
  • Both have a mechanism to lock the measurement from sliding.

Also Read: Difference Between Active And Passive Instruments

2 COMMENTS

  1. Excellent article and the illustrations! They make it the best resource I found that clearly maps the concepts of vernier calliper and micrometer screw gauge to the common sense intuition.

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