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If you’ve got one of those old mechanical scales in your bathroom , here’s your sign to upgrade to something more modern — and for less. Right now, you can grab this popular smart scale for just $12.59 at Amazon , 34% off its typical price of $18.

99. Unlike that old one in your bathroom, this doesn’t just track weight but also your BMI, body fat, bone mass, fat-free body weight, metabolic age, visceral weight and so much more. It links to your smartphone via Bluetooth and imports all of your metrics into an app for free, giving you charts so you can track your health on a daily, weekly or monthly basis.

All of that at a low price, and for what one reviewer says “is one of the best investments I’ve made.” When paired with Bagail’s Fitdays app or a health app you already use, like Fitbit or Apple Health, this scale gives you measurements about your body status and weight and tracks it over time, giving you detailed reports and plenty of data. You can set up multiple profiles on the app so multiple household members can track their weight, and several users say the scale automatically recognizes who’s on it, so you don’t have to worry about manually changing profiles or info.

It only takes a few seconds for your scale to transfer that dat.