TENS unit comparison: How should you compare TENS units?

When it comes to TENS unit comparison, you need to take into account factors such as price, battery life, controls, warranty, and others. The first thing that we need to understand is that the lowest price is not always necessarily the best.  As a consumer you don’t want the cheapest TENS unit; you want the best one for your particular needs. And while one of the characteristics of a good TENS device is a reasonable price, it isn’t the only one. A low price tag may come at the expense of quality and safety, and end up costing you more than you originally bargained for.
TENS units are designed to run for long periods of time. That’s great news in terms of lasting pain relief, but it can be hell on the battery life. Therefore, you need to either find the TENS device that gives you the most mileage out of batteries, or one that allows you to use rechargeable batteries. TENS machines usually require 9 volt batteries, which are often included in the package. Moreover, you can also buy the batteries separately. 

As part of a TENS unit comparison, you need to check whether the devices have adjustable, easy to manipulate controls. One of the reasons that people look for the pain relieving properties of a TENS machine is arthritis, a condition that can make it even more difficult to operate non-user friendly knobs and dials. Furthermore, fully adjustable controls allow you to be in full command of the unit’s settings, including treatment modes, intensities, and timer. Those settings may vary between devices, and since most patients need some time to figure out if/how a particular machine can provide them with relief for their type of pain, you might want to ask for a trial period. Some retailers allow users to try their units for a while before purchasing them. Otherwise, get a good grasp of the return policy before completing the transaction.
Along with the return policy, make sure that the unit has an advantageous warranty, for instance regarding repairs and replacement parts. It goes without saying that you should look for a portable, personal TENS device as opposed to the type that is used in a hospital or clinic, which are more expensive and complex machines. And even though you are better off with a TENS unit that you can use in the privacy of your home and without professional supervision, your doctor’s insight should be a key element when choosing a TENS device.