599.3. Periodic InspectionPerform the daily periodic inspection to use recorder correctly.The inspection is described bellow :9.3.1. Battery Pre-installation InspectionItems DescriptionNo damage or deformation from drops.No dirt, rust and scratches on any part.ExteriorNo cracking or rattling of the panel.Operation No damage for rattling of switches and buttons.Display No dirt or scratches on the display panel.Replace the cuff when a problem is found.The cuff is disposable.If there is a crack or adhesive matter in theconnection between the cuff and cuff bladder.If the air hose loses its flexibility and becomes hard.When the surface of the air hose becomes glossy orfeels oily.When the air bladder has cracks.#1 We recommend to replace cuffs every three years,regardless of frequency of use.The air hose is not to be folded. If air remains in the cuff,it may cause peripheral dysfunction due to stopping theblood flow of the arm.The cuff bladder is correctly inserted inside the cuffcloth.MeasurementCuffNo fraying of the cuff. The cuff doesn't ravel.Wearing tools No damage in the carrying holder, belt and cuff.Connection The air plug is connected to the air socket correctly.