Bring your scale to the diet club and try both side by side. The you will know. Bring one or two gallon water jugs and fill them up at the Diet Club (love that name reminds me of Fight Club
)
Fully loaded up with an extra 15 or so pounds of water see if the scales still agree with the difference between each other.
If the difference is large, get a new scale - I'm assuming the Diet Club's scale would be more accurate than yours but that's a WAG (Wild Ass Guess) - If the difference between the two (by difference I mean the difference in the weighed water) then I'd just keep using your own scale and know they'll be different by x lbs.
I completely trust my scale but I did spend a few hundtred dollars on one. It's basically this one with a stand. Model discontinued
http://www.scalesgalore.com/product...product_id=6801
OR, you can not care about what you weigh and consider the mater solved
You don't have much control over that day to day - or even long term anyway in my opinion.
Can you imagine the percision of the body to keep you withing the normal human range of weight for 50 years?! to me that's incredible and I didn't do a damn thing to make it so. It just happened by itself. Your body is here, it is a survival machine.
When was the last time you controlled how many breaths you breathed in one day? Me? Never.
If you do like to weigh yourself, get the best scale you can afford. I think this would preclude buy one from Walmart or Target.