Direct Biometric Weighing

These are implanted strain gauges that report to your cell phone or heads-up display. Scaled for the full range of weights, there are gram/ounce kits for fingers, pound/kilo kits for wrists, and kits for heavier weights for elbow and shoulders, and even spine kits (for one or two backbones.)

They'd be surgically implanted across the joint and do what my $20 kitchen scale does, except they would report precisely. You could hold your hand out the window of a speeding car and find out how fast the wind is going by. The same for current or speed in a kayak. How heavy exactly is one pallbearer's load? Shoveling exactly 1/2 ton of mulch is a snap. To say nothing of some transactions where precision is critical for trust in commerce.

Cooking? Wow. Set yourself to tare weight and speed through lab work. Know what the change in your pocket is worth, to the penny.

Not yet covered by health insurance.