Sometimes the tool isn't dirty, but an object is physically blocking the reading mechanism.
The error code on Mitutoyo Digimatic calipers typically indicates an overspeed error or a counter overrun , which can occur if the sensor loses track of its position or experiences an electrical glitch. This is often caused by physical interference, such as moisture, debris, or a sudden shock. Common Causes & Solutions mitutoyo caliper error code e05 link
While E05 is rarely a battery issue, a low voltage can cause erratic sensor behavior. Sometimes the tool isn't dirty, but an object
Genuine Mitutoyo calipers (500-196-30, etc.) never display E05. Contact Mitutoyo support with serial number if code persists. Sometimes the tool isn't dirty