Link | Mitutoyo Caliper Error Code E05

Error Code E05 Meaning

E05 on a Mitutoyo Digimatic caliper indicates a "Reading Error" or "Counter Overflow" — typically meaning the display has reached a numerical limit, or there is a signal interference between the scale and the readhead.

Common causes:

• The slider moved too fast (exceeding the processor’s tracking speed)
• Low battery causing unstable signal
• Dirt or oil on the scale (stator/rotor interface)
• Electrostatic discharge or temporary logic lock-up
• Internal counter exceeded ±999.99 mm or ±39.999 inches (rare, but possible if zero is set then moved far)

4. The Display Screw Torque

Mitutoyo calipers have tiny screws holding the display board. Vibration loosens them. A loose screw breaks the ground link. mitutoyo caliper error code e05 link

• Fix: Gently tighten the two small screws on the back of the display unit using a JIS (Japanese Industrial Standard) screwdriver. Do not overtighten.

1. The Battery Link (The #1 False E05)

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. Error Code E05 Meaning E05 on a Mitutoyo

• Fix: Replace the SR44 silver oxide battery (not LR44 alkaline, which has a different discharge curve). Clean the battery contacts with a pencil eraser.

When to Seek Professional Repair

If you have tried all the steps above and the error persists, you may have a hardware failure. The slider moved too fast (exceeding the processor’s

• Sensor Failure: The internal sensor head may be damaged (often caused by a drop or impact).
• Scale Damage: The scale strip itself may be scratched or dented. Once the physical scale is damaged, the caliper cannot hold accuracy and needs repair.
• Liquid Damage: If coolant entered the electronics, the main board may be shorted.

In this case, you cannot fix the caliper yourself. Contact Mitutoyo Technical Support or your local authorized service center for calibration and repair.

1. Contamination (The Most Common Cause)

The most frequent culprit is debris on the beam (the silver bar) of the caliper.

• Dust and Dirt: Fine metal shavings or shop dust can accumulate on the scale surface.
• Oil and Coolant: Excess oil or cutting fluid can create a film that interferes with the magnetic or capacitive sensor.
• Wipe Residue: Sometimes, dirty rags used to clean the tool leave behind lint or fibers that stick to the scale.