The diameter of the DAKOTA curved surface probe PT-104-2120 is R=50mm, which is a 5MHz frequency ultrasonic Thickness Gauge probe, PT-104-2120 Thickness Gauge range 1.27~380mm, with PR-82.

| Model | Thickness range | frequency | Probe diameter | High temperatures |
| PT-102-2000 | 1.0~152mm | 5MHz/wafer | Ø6.35mm | |
| PT-102-2700 | 1.0~152mm | 5MHz/wafer | Ø6.35mm | |
| PT-102-2900 | 1.0~152mm | 5MHz/wafer | Ø6.35mm/CT mode | |
| PT-104-9700 | 2.54~100mm/3.2-100mm(Penetration mode) | 3.5MHz/wafer | Ø12.7mm | |
| PT-101-2000 | 1.0~50mm | 5MHz/wafer | Ø4.76mm | |
| PT-101-2700 | 1.0~50mm | 5MHz/wafer | Ø4.76mm | |
| PT-104-0000 | 3.8~50.8mm(Medium Cast Iron) | 1MHz/wafer | Ø12.7mm | |
| PT-102-1000 | 1.5~100mm | 2.25MHz/wafer | Ø6.35mm | |
| PT-102-3300 | 0.63~152mm | 7.5MHz/wafer | Ø6.35mm | |
| PT-102-3700 | Penetration mode: 5.0~25.4m | 7.5MHz/wafer | Ø6.35mm | |
| PT-104-2000 | 1.27~508mm | 5MHz/wafer | Ø12.7mm | |
| PT-104-2700 | 1.27~508mm | 5MHz/wafer | Ø12.7mm | |
| PT-042-2000 | 1.0~152mm | 5MHz/wafer | Ø6.35mm | 340℃ |
| PT-042-2700 | 1.0~152mm | 5MHz/wafer | Ø6.35mm | 340℃ |
| PT-044-2000 | 1.27~508mm | 5MHz/wafer | Ø12.7mm | 340℃ |
| PT-044-2700 | 1.27~508mm | wafer | Ø12.7mm | 340℃ |
| PT-212-2001 | 1.0~152mm | 5MHz/wafer | Ø6.35mm | 480℃ |
| PT-214-2001 | 1.27~508mm | 5MHz/wafer | Ø12.7mm | 480℃ |
| PT-104-2120 | With PR-82/1.27~380mm | 5MHz | R=50mm | |
| PT-074-2906 | 2.54~100mm | 5MHz/UMX-2 | Ø12.7mm |