Focus on the pump mechanism life cycle; premium suppliers should guarantee at least 200,000 to 500,000 presses. For battery-operated units, inquire about energy efficiency, aiming for a battery life that supports 30,000 to 50,000 cycles per change. To simplify maintenance, choose modular designs where the pump head or sensor module can be replaced independently without discarding the entire unit, and prioritize refillable tank systems over proprietary cartridges to lower the Total Cost of Ownership (TCO).