Your mom’s antiquated spring-loaded home scale isn’t the most accurate or best way to measure progress. If you like the way your body looks, but the scale flashes a higher number than expected, it can seriously mess with your head.

That said, mining the trove of meaningful data provided by high-tech smart scales—body mass index (BMI), bone mass, body fat, etc.—is worth its weight in muscle.

A smart scale also sends a harmless electric current through fat, muscle, bone, and water to measure your body’s percentages of each.

Here, we weigh your smart-scale options.