http://www.relay-tester.com/quality and quantity of the strict implementation of the provisions of the contract. We guarantee to provide delivery, installation, commissioning, training and other services according to the contract. After-sales Service Commitment: After-sales service policy: from the date of arrival, free maintenance within the warranty period, lifelong preferential maintenance, free upgrade of supporting software. After the equipment is put into trial operation or normal operation, technicians of both parties shall test the technical indicators of the equipment. The system is in normal operation. After one year, the user will be asked about the system operation status by phone at the end of each quarter to answer any questions raised by the user. Failure of the control system ensures that a solution is provided to the customer within 48 hours.AC Test Transformer factory website:http://www.relay-tester.com/ website2:http://www.relay-tester.net/