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The HR (High Resolution) SmartBolt?s indicator, located in the center of the bolt head, remains yellow as the fastener elongates. When the design tension reaches approximately 85%, the indicator rapidly turns bright green. If the bolt is tightened beyond specifications, the indicator darkens until it is almost black. Should the bolt loosen more than 10 to 15%, the indicator returns to bright yellow, warning observers of a problem. ==============================================================