![Mitutoyo 293-821-30 [Digimatic] Digital Outside Micrometer 25mm (Ratchet Stop)](http://khmtools.com.ph/cdn/shop/files/293-821-30_z_jpg.png?v=1750512268&width=1)
![Mitutoyo 293-821-30 [Digimatic] Digital Outside Micrometer 25mm (Ratchet Stop)](http://khmtools.com.ph/cdn/shop/files/293-821-30_z_jpg.png?v=1750512268&width=600)
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Micrometers measure outside diameters, thicknesses and bores to a fraction of a millimetre. Machinists, quality inspectors, engine rebuilders and maintenance teams use them to check shafts, bearings, pins and machined parts.
How to choose a micrometer
- Type: outside micrometers measure shafts and thickness. Inside micrometers measure bores. Special types, such as point and can seam micrometers, measure grooves and can seams.
- Measuring range: each micrometer covers a set range, usually 25mm (0-25mm, 25-50mm and so on) or 1". Sets cover larger ranges, such as 0-12".
- Digital or mechanical: digital micrometers are quick to read and can switch units. Mechanical micrometers need no battery.
- Coolant proof: IP65 models resist coolant and dust in machine shops.
- Ratchet stop: a ratchet or friction thimble gives the same measuring pressure every time.
Popular micrometers at KHM Megatools
| Model | Type | Range | Good for |
|---|---|---|---|
| Mitutoyo 293-240-30 / 293-230-30 | Digital outside, IP65 | 0-25mm | Machine shops using coolant |
| Mitutoyo 293-145-30 / 293-146-30 | Digital Quantumike | 0-25mm / 25-50mm | Fast measuring with a quick spindle feed |
| Mitutoyo 293-821-30 | Digital outside, ratchet stop | 0-25mm | Everyday precision measuring |
| Mitutoyo 106-101 / 106-102 | Mechanical outside | 0-25mm / 0-1" | Reliable measuring without batteries |
| Mitutoyo 103-905-10 / 103-909 | Outside micrometer sets | 0-12" / 6-12" | Large shafts and parts |
| Mitutoyo Series 133 / 141 / 145 | Inside micrometers | Various | Bores and internal diameters |
| Wadfow WMCM1P25 | Mechanical outside | 0-25mm | Workshops and training use |
Micrometer or caliper?
A caliper measures outside, inside and depth in one tool and is quick for general work. A micrometer gives finer, more repeatable readings on critical parts. Many shops use both. See digital calipers, vernier calipers, digital micrometers and dial indicators.
All products from KHM Megatools are genuine and covered by the manufacturer's warranty where applicable.
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