Some scales have internal calibration masses, but external calibration with 1 or more precision masses is not uncommon. The scale needs to be placed/installed per the manufacture's specifications with regards to being level, a stable foundation to avoid problems with vibration, and temperature stability. To touch on a point raised in the comments, you cannot get this level of precision without taking care to eliminate sources of error. There are industrial scales with sufficient divisions that they meet the requirements for both capacity and resolution, though one would have to check with the vendor on whether it supports dynamic weighing to allow for fluctuations caused by a living subject. Which is unfortunate, because a key feature of veterinary scales is that they average the weight over time to account for the fact that living animals cannot keep still enough to get a steady reading with this much precision being expected. There are veterinary analytical scales that have 100,000+ divisions but they are focused on smaller lab animals and I haven't seen one above 32kg capacity. Unless your subject is small for a human adult, better than 50g is going to be tricky. However, veterinary scales are available with a greater number of divisions. They should meet their specifications on accuracy (typically given in terms of linearity and repeatability,) and precision (normally stated as readability.) As the comments have been saying, your daily weight fluctuations make higher precision of limited use, unless you are performing an experiment and addressing ingestion and excretion of food/water. Physicians scales are commonly capable of 100g resolution but I've spotted at least one with 50g resolution. Those certainly exist, but it does require more careful engineering than a consumer scale. A typical bathroom scale is 150kg, but medical scales are often available to accommodate more massive people.įor the sake of argument, I will assume you need at least 100kg capacity which means with 1g resolution, the scale must have 100,000 divisions. If the reported distance is 1.2 km, then the actual distance can be anywhere between km and km.When looking for a scale you also need to specify capacity.

What is the difference between reporting the length of an object as 980 cm (rounded to the nearest ten) and reporting it as 980.0 cm (rounded to the nearest tenth)? If the reported distance is 1200.0 meters, then the actual distance can be anywhere between meters and meters. On the boxes, type the two neighboring numbers that can appear on the scale (i.e., a weight that is slightly off) The actual weight can be anywhere between pounds and pounds.

The number line below is drawn to help us interpret a weight of 160.0 pounds. This weight scale shows 160.0 pounds (i.e., accurate to the nearest tenth of a pound). The actual weight can be anywhere between pounds and pounds. On the boxes, type the number that next larger number that can appear on the scale after 126.4. The number line below is drawn to help us interpret a weight of 126.4 pounds.

Transcribed image text: This weight scale shows 126.4 pounds (i.e., accurate to the nearest tenth of a pound).

Accurate 4 pound weight