Condit weighed in at 170.5 pounds while Kampmann tipped the scales at 170.
A smiling Kampmann (20-6) bounded up the steps to the stage first before a small crowd at Bankers Life Fieldhouse, which hosts Wednesday's televised card.
A more sombre Condit (28-7) followed, with the two fighters exchanging a frosty fist bump as they posed on the side of the stage.
Their fight has implications in the 170-pound division where Condit is ranked second and Kampmann sixth.
Champion Georges St-Pierre of Montreal meets No. 1 contender Johnny (Bigg Rigg) Hendricks at UFC 167 in November. On the same Las Vegas card, No. 3 Rory (Ares) MacDonald of Montreal faces No. 9 (Ruthless) Robbie Lawler.
Also Tuesday, sixth-ranked lightweight Donald (Cowboy) Cerrone weighed in at 156 pounds, a half-pound more than Brazilian opponent Rafael dos Anjos, ranked 10th. As is his tradition, Cerrone walked on stage in cowboy hat, boots and with an impressive buckle holding up his jeans.
Bantamweight Erik (Goyito) Perez made the most colourful entrance, wielding a Mexican flag and wearing a wrestling mask as he weighed in for his bout against Japan's Takeya Mizugaki, who seemed amused by his opponent's antics. Both men weighed in at 135.5 pounds, with Perez looking somewhat gaunt.
The weigh-in went without incident although matchmaker Joe Silva, in the role of peacemaker normally played by the absent UFC president Dana White, kept a close eye on lightweights Abel (Killa) Trujillo and (Relentless) Roger Bowling and welterweights Benny (Blanco) Alloway and Zak Cummings. Both pairings essentially touched foreheads as they moved closer and closer during their pose.
Kelvin Gastelum, winner of Season 17 of "The Ultimate Fighter" looked in good shape as he prepared to make his first appearance as welterweight against Brian Melancon after dropping down from middleweight.
All the fighters made weight, with former UFC welterweight Chris (Lights Out) Lytle and heavyweight Sean (Big Sexy) McCorkle in the audience.