Testers mentioned above don't recognize IGBTs. I got the the first one (by links list) for $6 only - the very same one but no case and probes (any need). So, as I just said it doesn't see IGBTs, it shows them as a diode. The second: capacitance of MOSFET' gate will be multiplied for misterious coefficient (many times!), which will be different each time. o_0 The rest it seems to be okay (pnps, npns, jfets, diacs, triacs, leds, zeners up to 4V5, capacitors' capacitance, ESR and losses percentage, inductors' inductance and ohmic resistance) - if your job is to sort out a bunches of transistors by parameters, the device is the very thing you need! Darlingtons? Well I steel have not the case, sorry!