Even the mediocre spring scales that they certify for vegetables and such are (generally) good anywhere in the territory of the country they were certified in, and often world-wide, with the caveats that you only use them within their rated range and with the seals intact.
Earth's gravity is not Entirely flat, but reasonably close enough for most places. I only know of one or two spots where the difference from the average is more than a small fraction of a percent, and even fewer if you compensate for altitude (farther from the core, lower pull).
I do have a gravitic anomaly map for the US and Caribbean if you'd be interested. I might even be able to find the USGS site I got it from ... ;-) Note that I really liked that psuedo-explanation for mass and weight!
(no subject)
Earth's gravity is not Entirely flat, but reasonably close enough for most places. I only know of one or two spots where the difference from the average is more than a small fraction of a percent, and even fewer if you compensate for altitude (farther from the core, lower pull).
I do have a gravitic anomaly map for the US and Caribbean if you'd be interested. I might even be able to find the USGS site I got it from ... ;-) Note that I really liked that psuedo-explanation for mass and weight!