Hello,
I have bought a batch of Bourns 1k variable resistors. The manufacturing tolerance is supposed to be 25% but when measuring the effective maximum resistance, I get figures as low as 640 ohms, so it seems to be closer to a 50% tolerance. Within the 10 units batch I have, almost all resistors do not reach 1kohm, their maximum is closer to 750 ohms.
Is it a usual situation for variable resistors ?
Hi, sounds like a bad batch, I'd expect 1K to be down to 0.9K, which is what I've got here with some odds and sods in my parts box.
Measure a 1K fixed resistor to check your DMM, but I agree they are low.
Tom... 
It sounds like they are from the reject bin. Did you get them from eBay?
No I got them from a retailer...
Sounds like he got them from the reject bin then.
That or you need to change the battery in your multimeter...