Answer:
Manufacturers of spring scales often do not place numbers next to all the markings on the faceplate for a few reasons:
Cost Efficiency: Printing detailed numerical markings on the faceplate of a spring scale can be expensive in terms of manufacturing costs. Simpler scales with fewer markings may be more cost-effective to produce.
Precision Limitations: Spring scales are not typically known for their high precision. They are often used for relatively rough measurements, and extremely detailed markings might give the impression of precision that the scale doesn't actually possess.
Adjustment and Calibration: Spring scales can vary in accuracy, and they may need to be calibrated or adjusted periodically. Placing fewer markings on the scale allows for easier adjustment and calibration since each marking can represent a broader range of values.
User Simplicity: Manufacturers often aim for simplicity in scale design to make them easy for users to understand and operate. Excessive markings can confuse users, leading to measurement errors.
Space Constraints: The faceplate of a spring scale may have limited space for markings, especially if it's a compact or portable scale.
In many cases, spring scales are used for relatively simple tasks where a rough estimate of weight or force is sufficient. More precise measurements are typically made using digital scales or other specialized instruments that can provide accurate numerical readouts. If you require precise measurements, it's often better to invest in a scale with a digital readout or other features designed for accuracy.