Last month, a Sri Lankan customer purchased a HZJQ-1B 100kV insulating oil dielectric strength tester from our company for the second time. Customer reviews highly approve of our product, he said: This is the 2nd BDV tester purchased from same supplier for our Company. 1st one bought in 2018 is still in use in our East African projects. New one is for use in Sri Lanka. Excellent customer service from Ms. Sunny. Very fast shipping (via DHL) and good packaging to prevent breakage, including for extra glass cups that were bought. Can Highly recommend this supplier !