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Do note that the specifications says accuracy 0.5% of 10,000m or +/-50mm (edit corrected to 50mm). This implies that you want to keep it at a constant (20C?) while sitting in the bucket, and even then the apparent water level can wander up +50mm or down -50mm and still be within specification. If the temperature changes then the accuracy specification doesn’t apply.
Range: 0−10,000 mm
Resolution: 1 mm
Accuracy: ±0.5% of full scale at 20 °C
NOTE: Depth measurement accuracy assumes no abrupt temperature variations.
For environmentally significant flows (low water depth measurement, with high temperature variation) it has a lot of noise on the signal.
Great instrument for measuring borehole water pumping ground water that is usually a constant temperature and large variation in depth.