Have a different Mitutoyo error code? Read our guides on E02 (Zero error), E06 (Over-speed error), or the infamous "Bar" (battery) symbol.

Lena shrugged. “Mitutoyo codes are cryptic. Sometimes it’s dust. Sometimes it’s a sensor, sometimes the ghosts in the machine. They don't usually explain themselves in plain English.”

A dying battery can mimic a communication error. When voltage drops below 1.3V, the logic chip tries to reset the data link repeatedly, flashing E05.

If simple cleaning doesn't work, the internal electronics may be compromised: E--05 error on a Digimatic caliper? - Practical Machinist

Use a lint-free cloth lightly dampened with high-purity isopropyl alcohol.