Take go and no-go measurements with the same tool. These gauges have a go gauge on one end, a no-go gauge on the other end, and a handle with bushings. They are used for precision go/no-go measuring of hole sizes and depths, checking hole location and distance, and setting micrometers. All come with an accuracy certificate traceable to NIST.

Check the minimum hole diameter with the go gauge end, and check the maximum hole diameter with the no-go gauge end. If the go gauge enters the hole and the no-go gauge is unable to enter, the hole is within tolerance.

Check the true diameter of holes, even if they’re bent or curved. The thin stem on these gauges flexes to reach features deep inside holes and cavities. Unlike standard plug gauges, these gauges have a ball end that centers itself in holes for accurate tolerance tests. They’re often used to inspect bearings and parts made with CNC or milling machines. If the ball passes through the hole, you know the diameter is at least as big as the ball. The handle makes it easier to reach holes that are deep or hard to get to compared to using gauge balls without a handle.

Confirm hex drives on socket head screws are within tolerance. A go and no-go gauge in one, these gauges are handy for testing hole size and depth in machining and manufacturing. Their handle gives you a good grip to insert each end into the hole you’re measuring. If the go gauge enters the hole and the no-go gauge is unable to enter, the hole is within tolerance. Gauges are made of tool steel, the most common material for plug gauges, because it’s strong, hard, and resistant to wear.

All come with an accuracy certificate traceable to NIST to certify their sizes are within tolerance. They also meet ASME B18.3, the same dimensional standards for hex drive fasteners.

Test thread tolerance in seconds. A time-saver for high-volume work, these drivers quickly thread gauges in and out of holes for you—just pull the trigger. A green ring lights up to let you know your internal threads are within tolerance. If they're not, the gauge won't thread in fully. To avoid jamming, these drivers reverse gauges out of holes as powerfully as they thread them in. The pistol grip minimizes hand fatigue during long periods of use.

These drivers have two speeds to suit the job you need. The high speed works for most applications, while the lower speed is ideal for your largest thread sizes, or when you need more torque. Fine-tune torque even further with the included torque adjustment tool. These drivers come with two batteries, so you’ll never be attached to a cord or without power. Use one battery while charging the other.