How should water-level sensor be evaluated when buying a lifting noodle cooker?

On a lifting noodle cooker, ignore the spec sheet and test the water-level sensor live. First find out whether the probe sits at the overflow or on the pot wall, and whether it is electrode or float type. Then watch how boiling foam, rapid draining, and refill surges affect its readings. The real risk is starch and noodle residue coating the probe, causing delayed or repeated refills. Fill to the marked line, cook three batches back to back, and log every refill against the actual level; a deviation beyond one centimeter means the supplier must reposition or fit a fouling-resistant sensor.