3M Matic 800RF case sealer is one of 3M's best machines. We purchased it from a company that paid $44,000 for it. We purchased it thinking that we would grow into it but it was way overkill for us. It has been unused for probably 5 years. It worked perfectly the last time we used it. It is in like-new condition. It has the lights on top to tell you when you are running out of tape and when you have run out of tape. Here's what 3M says about the machine:

Fully automatic random size case sealer for consistent flow and sealing without an operator. Automatically adjusts for various case sizes and folds the top minor and major flaps. Includes 3M™ AccuGlide™ II Taping Heads for low-impact tape applications. Handles case sizes: 10" - 24" long; 8" - 19.5" wide; 6" - 20" high. Up to 8 cases per minute. Powered gating section holds and meters case flow. Optically controlled in-feed separates cases from flooded line. Pneumatic controls and programmable logic controller adjust side belt feed, upper flap folding, and taping head for accurate operation. Operator is free to work elsewhere while unit folds upper flaps and seals cases. Controls can be located left (standard) or right. Emergency OFF buttons provided on both sides of unit. Friction brake drums prevent tape overrun and provide more consistent tape application.

Features 3M's advanced, patented, low-impact Accuglide II taping heads with curvilinear track which insures that even lightweight corrugated cases are securely and carefully sealed.