Types of bathroom scales

In comparison tests, digital bathroom scales perform much better than analog scales, which use a mechanical dial to display weight results. Analog scales can break more easily, and they calculate weight in larger increments than digital scales, which can make them less precise. Overall, experts say digital scales are a better choice for home use. That said, we read a number of consumer complaints about various digital scales, suggesting that their accuracy decreases over time. Whether this is the result of low battery function or another issue is difficult to determine.

Digital scales come in several varieties, including basic scales that measure weight only, as well as more expensive scales that can track your weight over time or store weight information for multiple users. Digital scales can also track body fat (also known as body-fat monitors). Experts are quick to point out that although body-fat monitors do not always provide an accurate estimation of body-fat levels, if used regularly under the same conditions (time of day, duration after a meal, etc.), changes over time can be useful for monitoring fitness progress. 

Professional scales -- similar in style to the scales one finds in a gym or doctor's office -- are the only mechanical scales that get high marks for accuracy, because they employ more durable components and have a heavy-duty balance beam, instead of flimsier internal springs. If you are obese or want the most accurate results, these large, sturdier scales are a good choice. However, they are expensive and can take up a lot of space. A few digital models offer high weight capacities coupled with a talking feature that announces your weight out loud for those who have difficulty reading a digital readout.

Here are some other things to keep in mind before buying or using a bathroom scale.

  • Pacemaker users and pregnant women should not use body-fat scales. People with pacemakers should avoid using body-fat monitors, because the scale's electrical currents can interfere with the function of these devices. Additionally, while there's no information that these scales are harmful to pregnant women, most manufacturers recommend avoiding them during pregnancy. 
  • Consistency is key. Trying out a scale in a store? It should give you the same reading each time you step on. For the most accurate results, weigh yourself at the same time each day under the same conditions. (Experts say first thing in the morning is best.) Body-fat scales, for example, shouldn't be used first thing in the morning, after a workout or after consuming alcohol.
  • The display should be easy-to-read. Digital scales with large displays and analog scales with big dials make it easier to read your weight. Some electronic scales have extra-large numbers or a backlit LCD for easier viewing. A few scales also have speech functions that announce the weight.
  • Body-fat scales provide approximations but can be useful. Experts say that body-fat scales don't use a very accurate method of determining percentage of body fat, so consider it a rough estimate only. Using a body-fat scale regularly under the same conditions can help monitor progress over time.
  • Scales with multiuser memory are good for family use. These scales can remember your last measurements, and some fancier models can wirelessly transmit data directly to your computer. Some models can store data for up to eight users.
  • Digital scales need batteries, usually four AAs or a lithium battery. Lithium batteries last longer. Some scales, like the Tanita Solar Digital Scale HS-302, rely on solar power and don't require batteries, but they're difficult to use in dim environments.

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