The user weighs himself with a small convenient battery-powered crane scale/hanging scale with hook and loop. The scale is permanently suspended between the ceiling lift belt and lifting equipment.
Scales specially made for use with a ceiling lift a are available, but they are much more expensive.
In Sweden: EK-industriprodukter, www.eip.se (last checked May 2017)
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In Swedeb digital hanging scales are also available at e.g. www.vagar.com (last checked August 2011)
This tip is from 2012