Temperature
RTDs
Thermocouples
Piezoelectric
Gauge, absolute, differential
Solids vs liquids
Bobber/Float
Weight/Hydrostatic
Density
Fouling
Head Pressure
Capacitive
Dielectric
Fouling
Radiometric
Danger
Optical
Dust
Ultrasonic
Single-point
Phased Arrays
Speed-of-sound changes
Radar
Frequency Bands
Gases, liquids, solids
Mass vs volumetric
Paddlewheel
Weight
Open-channel flow
Differential pressure
Thermal dispersion
Liquid Analysis
pH
Dissolved Oxygen
Conductivity
Turbidity
HPLC
Gas Analysis
Galvanometric
IR/FTIR
Paramagnetic
GC/MS