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The least count of a screw gauge is normally 0.01 mm (0.001 cm). It is calculated as Least Count = Pitch ÷ Number of divisions on the circular scale. For a pitch of 1 mm and 100 circular-scale divisions, LC = 1 ÷ 100 = 0.01 mm.
A screw gauge (also called a micrometer screw gauge) is a precision instrument used to measure very small lengths — such as the diameter of a wire or the thickness of a thin sheet — far more accurately than a ruler or even a vernier caliper.
Precision micrometer screw gauge for physics labs — ratchet stop, lock nut and 0.01 mm accuracy. Manufactured in Ambala by Samtech Instruments and shipped across India.
A screw gauge is a mechanical measuring instrument based on the screw and nut principle. When the screw makes one complete rotation, it advances by a fixed distance called the pitch. By dividing this small movement across many divisions on a circular scale, it can measure lengths as small as 0.01 mm. It is used to measure:
The least count is the smallest length an instrument can measure accurately. The smaller it is, the more precise the tool. A screw gauge (0.01 mm) is finer than a vernier caliper (0.1 mm or 0.02 mm).
Pitch = distance moved on the main scale in one full rotation
Pitch = 1 mm, 100 divisions.
0.5 mm per rotation, 50 divisions.
MSR = Main Scale Reading · CSR = Circular Scale Reading
Example: MSR = 4 mm, CSR = 35, LC = 0.01 mm → Total = 4 + (35 × 0.01) = 4.35 mm.
Correct reading = Observed reading − Zero error (with sign).
| Screw Gauge | Vernier Caliper | |
|---|---|---|
| Typical least count | 0.01 mm | 0.1 mm or 0.02 mm |
| Best for | Very small thicknesses / diameters | Lengths & diameters |
| Principle | Screw & pitch | Vernier scale |
See our full Vernier Caliper Least Count guide.
Samtech Instruments — physics lab equipment manufacturer in Ambala, supplying schools & colleges since 1959.
Order the 0.01 mm micrometer screw gauge direct from Samtech Instruments, Ambala — ideal for schools, colleges and quality-control labs. Bulk pricing available.
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Updated 3 August 2026 10 min read By Samtech Instruments A tripod stand is one of the most essential yet
Samtech Instruments, established in 2002, is a leading manufacturer & supplier of Educational Meters, Solar Energy Kits & Scientific Instruments.
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