The Park Tool DS-1 Scale is convenient to use and appears to provide accurate weight measurements. I like that the design accommodates using it in the Park Tool PCS-10 work stand, which is how I mount it for use in my apartment. The 2 prong hook allows for easy balancing of a bikeframe to provide good results. While there may be some slightly less expensive scale options out there, I'm glad I chose the DS-1.
I needed a torque wrench after purchasing my first carbon bike. Looked at others, but this one had the widest range of torque settings and the brand reputation for quality. Kind of expensive, but not too bad if purchased on sale.