The abbreviation TT is not unknown. A car bearing the same two letters stands for tradition and technology. This aspiration is easily fulfilled by the reworked Ternos Professional TT: it is water-resistant to a depth of up to 500 meters (50 ATM), can automatically regulate gas pressure via a helium valve and a bicolor, a rotatable bezel that now provides visual support for the 15-minute limit before resurfacing. This last feature is what really gives the Ternos Professional TT its name: Two Tone – in either blue-black or Gray-black.