美国采购需求：亚洲检验、检验定义、检验设备、质量控制中的检验、检验质量、检验质量保证

I'm interested in arranging a pre-inspection for a shipment in Shenzhen bound for the US, specifically for an ultrasonic dog trainer. There are 540 units in total, and I want to ensure that everything meets quality standards before shipping. Could you provide details about the inspection services you offer, including the associated costs and the typical timeline for completing the inspection? Your quick response would be greatly appreciated, as I'm working to finalize the logistics soon. Thank you!