I'd have to double check but I think robos are actually capable of jumping 2 feet in the air. Definitely be careful transporting and such as they are extremely good escape artists!
For US owners, Walmart should sell a carrier that would be great for the purpose of weighing as well as transporting robos or really any hamster species.
https://www.walmart.com/ip/Aqua-Cult...-Fish/20607984
I know similar things would be available in the UK from different brands. While some people may prefer other carrier styles for hamsters, it is still a good option especially in the US since it is so much easier to find in my experience.
Weighing and transporting hamsters in secure containers is much safer than using open containers and such. Not everyone is going to have a disaster happen after doing so, but taking precautions when serious injury risks and escape risks for example are present is a very good idea for anyone involved!