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Warranty and Service Policy


The products manufactured by Longrun Industrial Instrument Co., Ltd. are warranted to be free from defects in materials and workmanship for a period of one year from the date of shipment to the original purchaser. Longrun Industrial Instruments' obligation should be limited to restoring the meter to normal operation or replacing the meter, at Longrun Industrial Instruments' choice, and shall be conditioned upon receiving written notice of any alleged defect within 10 days after its discovery. We will determine if the return of the meter is necessary. If it is, the user should be responsible for the one-way shipping fee from the customer to the manufacturer.


For operational problems, please contact the technical support department by telephone, fax, email or internet. In most cases, problems could be solved immediately.

For any hardware failure of the instrument, we recommend our customers to send back the instrument for service. Please contact the technical support department with the model number and serial number of the unit before sending the unit back to us. Both numbers can be found on the product label. For each service or calibration request, we will issue a Return Materials Authorization (RMA) number. Take notice that the cost for repairing can only be determined after receipt and inspection of the instrument. A quotation will be sent to the customer before proceeding with the service.