VERTICAL POLE BUBBLE.

VERTICAL POLE BUBBLE.

Factory Calibration: The vertical bubble is typically factory-calibrated for precision.

Field Calibration: Some advanced models can be recalibrated in the field using a specialized tool or process.                                                                                                                                                           Design Variations: Standard Vertical Bubble: The most common version, used for most survey and construction tasks.                                                                                                                                   Adjustable Vertical Bubble: A version that allows for fine-tuning adjustments.