If you see E05 only when a data cable is plugged in, the problem is the external link. If you see E05 when nothing is plugged in, the problem is the internal main board.
If you have cleaned the scale, replaced the battery with a genuine SR44, and performed a reset, but the E05 code persists, there may be a hardware failure. Because Mitutoyo tools are high-precision instruments, internal repairs should be handled by an authorized service center to ensure the tool remains calibrated and accurate to manufacturer specifications. Preventing Future E05 Errors Wipe down your caliper after every shift. Store the tool in its fitted case when not in use. mitutoyo caliper error code e05 link
Essentially, the caliper is telling you: "I cannot measure accurately because my vision is blurry." If you see E05 only when a data