Which of the following actions is NOT a recommended precaution to guard against counterfeit money?

Measuring the dimensions of a bill is not a recommended precaution for detecting counterfeit money because genuine currency is manufactured to strict specifications and is consistent in size. While it might seem logical to check dimensions as a method of authenticity, counterfeiters can replicate the size of a bill fairly accurately, making this method unreliable.

In contrast, the other methods mentioned—using a pen to check for authenticity, examining the watermarks, and feeling the texture—are effective ways to identify counterfeit currency. For instance, the pen test detects the presence of certain fibers that only real bills have, while examining watermarks is crucial since legitimate currency features intricate watermarks that are difficult to replicate. Additionally, the texture of genuine currency is distinct due to the specific printing process and quality of materials used, allowing for tactile recognition.

Understanding these precautionary measures can help anyone handle cash transactions more safely, especially in environments where counterfeit money is prevalent.