Anyone have any experience (good or bad) with the RK2671A DC/AC Hipot tester, probably from Shenzen Meiruike Electronics? http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&Item=390104450926&Category=4678&_trkparms=algo%3DLVI%26its%3DI%26otn%3D2 Failing that, any recommendations for a good brand/model to look for in the used market? Thanks, Jim, N7CXI