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.
One machinist noted: "E-05 error code on the Mitutoyo is probably because you are working with coolant or liquid and some may have got through the seal" . If moisture infiltrates the housing, the electrolyte can short the sensitive electronics, causing the code. mitutoyo caliper error code e05 link
Troubleshooting usually starts with simple cleaning and resets before moving to more invasive mechanical repairs. E--05 error on a Digimatic caliper? - Practical Machinist A dying battery can mimic a communication error
If the steps above fail, you have a hardware failure of the "internal link." This voids your warranty, but if your caliper is out of warranty, here is how to fix the E05 link error. If moisture infiltrates the housing, the electrolyte can
The data cable is not securely seated in the caliper output port or the receiving USB/Digimatic port.
Remove the battery, short the terminals for 30 seconds, then—with the caliper fully closed—reinsert the battery. For height gages, you may need to open the unit and manually re-tension the encoder gear as described earlier.
If the caliper was dropped, the sensor may have shifted away from the scale.