You’re still working with the best concrete RH test in the industry. Feel free to use the rest of your 4.0EX Smart Sensors. When you’re ready to replenish your sensor stock, simply order a new value pack of L6 sensors, since they come with the new Total Reader for FREE (until May 2020). You’ll also need the NEW Rapid RH L6 Insertion Tool. Once you have these, you’re ready to make a seamless transition to the next generation of RH testing technology for a relatively small additional investment. We’re confident that you’ll be impressed with the added features.