Endress + Hauser
| Continuous Technologies | Point Level (Switches) |
| Radar Level | Vibrating Tuning Fork |
| Guided Wave Radar | Ultrasonic |
| Ultrasonic | Capacitance |
| Hydrostatic | Conductivity |
| Differential Pressure | Rotary |
| Capacitance |
Optech Inc: Laser Level Instruments
Masoneilan
- Displacer/Torque Tube Continuous Level System
- Proven Technology
- High Temperatures
- Hart Protocol
- Easy Calibration