Mitutoyo Caliper Error Code E--05 (often appearing as E-05) is primarily identified as an overspeed error missing scan data

: A weak battery (SR44) can cause the internal processor to glitch, leading to the E--05 code.

While the battery is out, use a clean, lint-free cloth (or a specialized precision wipe) to gently wipe the exposed beam (the long metal rail) where the slider moves. Do not use compressed air, as it can blow debris under the scale. Do not use alcohol if your caliper has a paper scale (older models). For modern Mitutoyo calipers with hardened steel or ABS scales, a dry microfiber cloth is best.

Remove the four small screws on the back of the slider to carefully lift the cover.

A dying battery (below 2.7V under load) cannot maintain a stable reference voltage for the capacitive encoder. The signal becomes noisy, and the processor interprets the noise as "excessive speed" or "garbage signal."

If you are working in a very humid environment or near machinery that generates heavy electromagnetic interference (like a high-frequency welder), the sensor may struggle.

Dropping the caliper can shift the internal encoder. If the error persists after cleaning and a battery swap, internal parts may be misaligned.