What does full deflection of a survey meter during a battery check indicate?

Full deflection of a survey meter during a battery check indicates that the meter is responding to the power supplied by the battery. This does not, however, confirm that the meter is functioning properly in terms of detecting and measuring radiation. Thus, the conclusion is that the meter may or may not be working correctly. A full deflection simply shows that there is enough power for the needle to move; it does not assess the meter's accuracy or calibration in measuring radiation levels.

For a meter to be properly validated, additional tests related to its performance under known radiation sources would be necessary. This ensures that not only is the battery functional but also that the entire measurement system is working as intended. So, while full deflection indicates battery engagement, it cannot be solely interpreted as an indicator of the overall operational integrity of the survey meter.