Megger (insulation resistance tester) needed (UNI-T UT502 an option?)

[larry42]

Hi, recently I needed a megger for insulation testing (2500V) for some small scale testing of a unit for a customer.

The Fluke and Megger ones are expensive (1500-2500 USD) when you need >1000V.

I've seen plenty of cheap ones on Ebay

http://www.ebay.com/itm/UT502-Insulation-Resistance-Tester-2500V-20G-ohms-/261048675881?pt=BI_Electrical_Equipment_Tools&hash=item3cc7b6ae29

Specifically the UNI-T UT502 looks like it does what I need. I know that UNI-T do multimeters of varying quality.

I'm *very* skeptical of buying something that outputs 2500V from a low cost Chinese brand, moreover I wonder if the results would really be trustworthy.

Any thoughts?

PS
I plan to buy a B&K PR-28A (looks identical to the Fluke 80K-40) high voltage adapter so that I can measure the output voltage of the UNI-T, to check that the unit is outputting something near specifications.