Just moved into a new flat, and after getting a little buzz from my macbook case (not as dodgy as it sounds, well documented as occurring when using non-earthed duckbill style power adaptors), I went around the place with my outlet checker (same as this, but Hamer branded http://www.jaycar.co.nz/productView.asp?ID=QP2000). Most outlets came out fine, except for a couple which indicated 'earth not connected' (L-E light up, but not L-N).
Can someone put this in perspective for me - how bad is this? How reliable are such testers, given that it did indicate most outlets in the house were fine?
One outlet is a shaver outlet in the bathroom that is rarely used, the other is in the middle of the kitchen and heavily used with phone/laptop chargers, microwave, router, phone.
Landlord is really good, will get them to book a sparky if it is indeed a problem, but would like to know how hard to push if you know what I mean.