Editing Weighing scale (section)

===Domestic weighing scales===
[[File:Feet on scale.jpg|thumb|right|A mechanical bathroom scale. Pressure on the internal springs rotates a disc displaying the user's weight in pounds.]]
Electronic digital scales display weight as a number, usually on a [[liquid crystal display]] (LCD).  They are versatile because they may perform calculations on the measurement and transmit it to other digital devices.  On a digital scale, the force of the weight causes a spring to deform, and the amount of deformation is measured by one or more [[transducer]]s called [[strain gauge]]s.  A strain gauge is a [[electrical conductor|conductor]] whose [[electrical resistance]] changes when its length changes.  Strain gauges have limited capacity and larger digital scales may use a [[hydraulic]] transducer called a [[load cell]] instead. A voltage is applied to the device, and the weight causes the current through it to change.  The current is converted to a digital number by an [[analog-to-digital converter]], translated by digital logic to the correct units, and displayed on the display. Usually, the device is run by a [[microprocessor]] chip.

====Digital bathroom scale====
A digital bathroom scale is a scale on the floor which a person stands on.  The weight is shown on an LED or LCD display. The digital electronics may do more than just display weight, it may calculate body fat, [[body mass index|BMI]], lean mass, muscle mass, and water ratio.  Some modern bathroom scales are wirelessly or cellularly connected and have features like smartphone integration, cloud storage, and fitness tracking. They are usually powered by a button cell, or battery of AA or AAA size.

====Digital kitchen scale====
Digital kitchen scales are used for weighing food in a kitchen during cooking. These are usually lightweight and compact.

====Strain gauge scale====
In electronic versions of spring scales, the deflection of a beam supporting the unknown mass is measured using a [[strain gauge]], which is a length-sensitive [[electrical resistance]]. The capacity of such devices is only limited by the resistance of the beam to deflection. The results from several supporting locations may be added electronically, so this technique is suitable for determining the mass of very heavy objects, such as trucks and rail cars, and is used in a modern [[weighbridge]].

====Supermarket and other retail scale====
These scales are used in the modern [[bakery]], [[grocery]], [[delicatessen]], [[seafood]], [[meat]], [[produce]] and other perishable goods departments. Supermarket scales can print labels and receipts, mark mass and count, unit price, total price and in some cases [[Tare weight|tare]]. Some modern supermarket scales print an [[RFID]] tag that can be used to track the item for tampering or returns. In most cases, these types of scales have a sealed calibration so that the reading on the display is correct and cannot be tampered with. In the US, the scales are certified by the [[National Type Evaluation Program]] (NTEP), in South Africa by the [[South African Bureau of Standards]], in Australia, they are certified by the [[National Measurement Institute, Australia|National Measurement Institute (NMI)]] and in the UK by the [[International Organization of Legal Metrology]].