Testing suspicious LT1006CN8 and TLE2141CP operational amplifiers from eBay. How to test the output voltage swing (low and high state output voltage) and the common mode input voltage range. These are obviously fake and both behave exactly the same, despite having a different marking and coming from different sellers. The output voltage swing is quite poor on the negative side. The common mode input voltage range doesn't cover V- as it should (they're not actually ground sense op-amps). They don't meet their datasheet specifications.
UPDATE: I got refunded for both types.

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