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Rob I would avoid digital scales unless you intend on spending big bucks.I do a lot of fishing and have went through a few scales,the problem is a lot of cheap digital scales have a large max weight(ie 40kgs).The larger the max weight the more accuracy you lose.If you are weighing bikes,a max weight you should go for is 20kgs.This scale will have a +- of 1oz.Go for a dial scale,far far more consistent.I use expensive scales but also have a set shown in the link and find them 100%. http://www.billyclarke.co.uk/en/scales- ... b-1oz.html
They are usually out from +/-8oz to 1.5lbs.If a bike needs to be weighted accurately thats too much of a variation.The Reuben Heatons in the link for £22 are money well spent.