A standard deflecting beam torque wrench requires the user to look directly down on the scale to read it properly. That’s where the user error comes in. If you look at the scale from an angle you won’t be able to read it correctly. A Warren & Brown has a pin that you push in to set the torque wrench before you use it. When the correct torque is reached the pin will “pop”. The “pop” is both visible and audible. I other words the wrench alerts you when the torque is reached.
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