When you just need to reach the top-shelf, it's the the Extendo-Reach Exoskeletal Robotic Grabber Arm. Each will extend your reach by 4 meters. Still can't reach that can of tomatoes? Use a grabber arm with your grabber arm! It's grabbers all-the-way-down at Extendo-Reach.
Known bugs for 0.13.6 and below
Ctrl-clicking to add to inventory will fail to extend your reach. Insert each grabber into your modular armor manually. This is fixed in 0.13.7