SparkFun TOL-10997 6″ Digital Calipers
Digital calipers are an absolute essential. Here at SparkFun we use them all the time. These premium calipers come with an extra battery and auto shut-off. Measurements can be taken in either metric or standard. The calipers are 6″ in length and make a great addition to any tool set.
These come with two 1.5V LR44 button cell batteries.