A New Hampshire auction house is letting bidders have a chance to own an EKG recording of Neil Armstrong’s heartbeat just before they landed on the moon. The item is just one of several items from the historic Apollo 11 mission.

According to The Space Reporter, the EKG recorded the tense moment as Aldrin and the late Armstrong became the first humans to step on the moon.

RR Auction is auctioning off the item and expects it to go for over $3,000. The historical significance of the piece will likely push the price even higher.

PCMag notes that the reading is noteworthy because it shows that Armstrong was actually very calm at that historic moment. Gerald Schaber, the geologist who monitored their heartbeats, told The Gaurdian back in 2009 that, while Armstrong was calm, Aldrin's heart was "racing."

"...That was typical of Neil," Scaber recalled. "Just like the first thing he really said was, 'Houston we have engine shut down here,' really calmly. Mission control told him to he speak again. It was then he said, 'The eagle has landed,' for the TV networks. He was just that cool."

It is part of the Amherst-based auction house’s Space & Aviation Auction, which will be held from May 16 to May 25. A joystick that was used to land the lunar module and several other items from the Apollo 11 mission will be auctioned off.

Armstrong, Aldrin and Michael Collins piloted the Apollo 11 mission and Armstrong became the first human on the moon on July 20, 1969. Aldrin also walked on the moon.

Armstrong died in August at age 82. He died following complications from cardiovascular procedures.