bathometer (noun)

1. During the baptism ceremony, the priest used the bathometer to measure the depth of the holy water.

2. In the mystical world, the wizard relied on his enchanted bathometer to determine the depth of the magical lake.

3. In the adventure movie, the brave explorer used a high-tech bathometer to measure the depth of the treacherous ocean.

4. The architect used a bathometer to calculate the depth of the water feature in the luxurious indoor pool of the mansion.