The least count of a 10 micron dial gauge is 10 microns.
A dial gauge's least count refers to the smallest measurement increment it can accurately display. When a dial gauge is referred to as a "10 micron dial gauge," it directly indicates that its minimum measurable division, or least count, is 10 microns.
Understanding Least Count in Dial Gauges
The least count is a critical specification for any precision measuring instrument, including dial gauges. It determines the instrument's resolution and, consequently, the precision of the measurements taken.
- Microns and Millimeters: One micron (µm) is equal to one thousandth of a millimeter (0.001 mm). Therefore, 10 microns is equivalent to 0.01 millimeters. This means a 10 micron dial gauge can detect changes as small as 0.01 mm.
Common Dial Gauge Least Counts
Dial gauges are manufactured with various least counts to suit different measurement needs, ranging from general workshop use to high-precision applications. Here are some typical specifications for dial and digital indicators, showcasing their respective least counts:
| Measurement Range | Least Count (mm) | Least Count (microns) |
|---|---|---|
| 0-10mm | 0.01mm | 10 microns |
| 0-10mm | 0.001mm | 1 micron |
| 0-25mm | 0.01mm | 10 microns |
| 0-25mm | 0.001mm | 1 micron |
As shown in the table, dial gauges with a 0.01mm least count are common, and these are precisely the instruments referred to as "10 micron dial gauges." For even finer measurements, gauges with a 0.001mm (1 micron) least count are available, offering higher precision.
Importance of Least Count
The least count directly impacts the accuracy of measurements. When selecting a dial gauge, it is crucial to choose one with a least count appropriate for the required measurement tolerance. Using a gauge with a least count too coarse for the job can lead to inaccurate readings and potentially flawed products or designs. Conversely, using a gauge with an unnecessarily fine least count might be overkill and add to the cost without significant practical benefit for less critical applications.
