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171. Which of the illustrated devices would be the LEAST accurate for the purposes of weighing-in a refrigerant charge
Choice C is the least accurate because a mechanical spring scale provides poor resolution and is susceptible to friction, wear, and loading errors when measuring refrigerant charge. Electronic platform scales and digital hanging scales offer higher resolution and repeatability. A calibrated charging cylinder is more precise than a spring scale. Therefore, the spring scale's limitations make it the least suitable option for accurate refrigerant weighing.
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