With the Seca 212 measuring tape of non-stretch Teflon synthetic material, one can measure both the head circumference (front side) and the symmetry of the face (reverse side). A practical dispenser (containing 15 tapes) ensures that they are stored safely with no risk of damage.Measuring tape for head circumference of babies and toddlers.
- Measuring range : 5-59 cm / 2 - 23 inch
- Graduation Length : 1mm / 1/16 inch
- Weight : 0,1 lbs / 60 g
- Dimensions : 25 x 1 x 663 mm / 1 x 0.04 x 26.1 inch / 140 x 145 x 30 mm / 5,5 x 5,7 x 1,2 inch
- Functions : Mobile measuring
Weighing and measuring correctly - just that easy!
Determining your own body weight and size is child's play. Just stand on a working scale and read the displayed weight. Or, adjust a measuring rod, apply the measuring tongue and read the result. However, even with such simple operations errors can creep in that can falsify the result up or down.
Determine exact body weight
Body weight fluctuates during the course of the day by about one kilogramme for children and two kilogrammes for adults. If you want to know if and how much you have lost or gained, observe the following tips:
Place the scale on a solid base.
Always leave the scale at the same place.
It is best to weigh yourself in the morning after getting up.
Do not eat or drink anything before you weigh yourself.
Wear no clothes when weighing yourself.
Stand on the scale quickly and evenly, stand still and read the weight.
If you stand on the scale with clothes and do not need an absolutely accurate measurement result, you can deduct the following values: Jeans: approx. 700 g
T-shirt: approx. 250 g
Shirt/blouse: approx. 250 g
Determine exact body size
Body size also changes during the course of the day. The same person can be three centimetres taller than in the evening. There is a natural explanation for this. The constant load on the spinal column means that the spinal discs are compressed during the course of the day and with 23 spinal discs, that can mean two or three centimetres. At night, the spinal discs regenerate by absorbing nutrients from their environment.
Observe the following to ensure a precise determination of body size:
Push the measuring tongue into a horizontal position according to the person to be measured.
The person to be measured stands with his back against the measuring rod.
The feet must stand closed on the foot positioner.
The back must be straight.
The head must be straight according to the "Frankfurter Linie". The "Frankfurter Linie" is an imaginary horizontal from the ear to the eyes.
The caliper gauge is pushed on the head so that the measuring tongue rests without sagging.
Read the result.
Weighing - a science in itself
1. Adjustment or: Why does one weigh more at the North Pole than on Kilimanjaro?
Answer: An electronic scale measures the force with which a person is pulled by the earth. This force depends on location. It gets smaller and smaller the further the scale is from the centre of the earth. Therefore, a scale must be correctly adjusted for its location of use. Otherwise, a person who weights 80 kg at the North Pole would weight only about 79.1 kg on Kilimanjaro. Scales not adjusted for this difference in the earth's gravitational pull cannot be used in medicine, since every gramme nearly always counts in medicine. Before a seca scale is delivered, it is precisely set for it future location of use.
2. What does calibration mean?
Answer: In the countries of the European Union, for example, scales and measuring instruments used in the medical field must be calibrated. The calibration is used to determine the error limits of a scale. The smaller the error limits, the more accurate and better the scale. A calibrated scale is therefore of greater value than an uncalibrated scale. Most seca scales are available in calibrated and uncalibrated versions.
3. What is the difference between a seca scale and a scale from the supermarket?
Answer: What is the difference between a personal scale from the supermarket and a seca scale? Both, for example, have the same number scale with a 1 kg gradation.
The difference is that the seca scale displays the exact weight it measures. The scale from the supermarket shows the weight which only loosely corresponds to the actual weight. The supermarket scale is not very accurate. By the way, that applies to both mechanical and electronic scales.
Definition of accuracy - The accuracy of a scale is the degree of agreement between the displayed and correct value. It is determined by the intrinsic error limits and influencing effect limits. In other words, accuracy depends on the quality of the components, the quality of the load cell and environmental conditions. An environmental condition that affects accuracy can be the temperature or humidity. Under error limits for calibrated scales is understood the permissible tolerance, i.e. the permitted weight deviation by plus and minus. They are load sensitive and defined in the calibration regulations.
Definition of gradation - Gradation is the smallest possible readable distance between to weight values. For digital scales, it is identical to readability. For mechanical scales, it is the smallest weight value on a scale consisting of dividing lines and numbers that are read with a pointer or index.
4. How do mechanical and electronic scales work?
Mechanical, electromechanical and electronic scales
The first scales that carried the seca logo were mechanical models. Scales are still found today in the range of products that evoke memories of the classic scales, which are of course much improved. In the course of further technical development, electromechanical scales came more into use. With these products, the weight is determined mechanically, but displayed digitally. Today, electronic scales ensure precise measurement results. Practical equipment and auxiliary functions round out weighing technology.
A mechanical flat scale works as follows. The weight acting upon the platform of the scale is transferred to a load lever system. The system reduces the weight acting upon the platform to the measuring equipment by a fixed transformation ratio. A weight that presses on the platform with 100 kg, for example, is reduced to 10 kg. In other words, the transformation ratio is 10:1. The load lever system is connected to the pointer by a pinion, so that the weight is displayed directly and without delay on the round dial scale.With mechanical baby scales, free-moving weights are pushed onto a bar until balance is achieved and the result can be read.
Electronic scales use various technologies to determine weight. seca uses the patented tuning fork sensor technology amongst others. This technology ensures not only accurate results, but also reduces energy consumption compared to conventional digital measurement methods by a thousand fold. The result is easily read from the digital display. The energy source is most often a battery. There are also models with a mains plug. It is important that the scale has an energy-saving automatic shutoff. Some electronic scales can display more than weight. For example, they automatically calculate the BMI value if the body size is entered in advance.
The pitch of a violin string depends on the force that is used to clamp it. Following this principle, seca uses two opposing tuning forks connected at their ends on which a crystal has been soldered. Both crystals are operated in such a way by a suitable electronic circuit that the tuning forks continually swing. And with a pitch that depends on the force at which the ends of the sensors are pulled. The person being weighed causes the "pull".
How do I calculate my BMI?
Answer: The Body Mass Index, BMI for short, is the only value scientifically recognised worldwide for interpreting nutritional condition.
BMI = body weight in kg / (body size in m)2
The interpretation of the BMI according to World Health Organization (WHO) criteria:Underweight: < 18.5
Normal weight: 18.5 – 24.9
Overweight: 25 – 29.9
Obese: ≥ 30
Severely obese: ≥ 40