Pneumatic torque wrench.
Fullsize image: https://diqn32j8nouaz.cloudfront.net...r_fullsize.jpg
Previously:
Hydraulic torque wrench - GIF
Enormous torque wrench - photo
Tiny inch-grams torque wrench - photo
Hand-cranked torque multiplier lug nut wrench - GIF
Bolt with built-in tensile strain gauge - photo and patent
Torx key with torque indicator - photo
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