In October, A High voltage switch factory in mexico went through a lot of inspection, and purchased a batch of SXGK-H Circuit Breaker Tester and SXHL-II Contact Resistance Tester in Sansion electric power in November. Sansion made a factory inspection for the high voltage switch tester.The Tester was completed successfully and all the date met requirement. Power Source at Customized for customer :120V 60HZ Please contact us sansionpower@hotmail.com or sales@sansionpower.com Mrs. Ying Ying for more details.