Before the Industrial Revolution and the concept of mass production, tools were more "ergonomically" correct than those used today. Back then, tools were usually designed and produced for a specific user. With the introduction of the assembly line and mass production, tool design was limited by production capabilities. Today's tools are mass-produced and designed for the non-existent "average user". This means they fit most people somewhat, but no one particularly well. There is also a similar lack of fit between the way the tool is designed and the way it is used. Most tools today are designed to do a multitude of similar tasks adequately, but none optimally.

Since individual tool production is not an option, the main question a tool buyer should ask is: Is this how I would have made the tool?

Things to consider when selecting and/or purchasing a tool, either for on or off the job use, are:

Does the tool make me do more work than necessary?

• Power tools require less exertion on the part of the user.
• Lighter tools require less exertion. Heavier tools should be suspended and counterbalanced.
• Spring-loaded tools require less exertion as the spring opens the hand vs. the hand opening the tool.
• Tools that do not waste motion (saws that cut in both directions, for example) require less exertion.
• Poorly maintained tools require the user to work harder. Replace worn tips, bits, and sockets and sharpen dull cutting tools.

Does the tool fit my hand?

• Handles should be made of compressive, non-slip material. Soft materials such as Sorbathaneâ or Viscolasä found in commercial tool wraps (also called Grip Kits), add a compressive layer to a tool's handle increasing the total diameter, allowing it to take the shape of the user's hand.
• Handles should span both sides of the palm to avoid pressure on the collection of nerves and soft tissues in the palm. For most users, handles should be at least 5-in. long.
• Handles that fill the palm distribute force over a broader area. A diameter approximately 1.5-in. to 2-in. is desirable.
• Grip strength is greatest for most users at a grip span between 2.5-in. to 3-in.
• Triggers should be at least 2-in. long so they can be activated using multiple fingers. Single-finger triggers encourage the development of "trigger finger", a repetitive stress injury that can be painful and is characterized by clicking, snapping, or locking of the tendons in the affected finger.
• Sharp edges do not fit the contours of the human hand and can create pinch and pressure points.
• "Finger grooves" show that the tool was made to fit a hand, just not your hand, and should be avoided.

Does the tool fit the task?

• Tools should be oriented for use with a neutral wrist posture.
• In-line and pistol grip options should be available for drivers and used in the appropriate situation.
• Many bent handle tools are now available for specific jobs and should be used to avoid wrist deviation.

Any tool can be labeled "ergonomic" by the manufacturer, but by taking a minute to think of how the tool will fit the user, the task, and its orientation to the task, you can decide for yourself.