EMCEE Electronics is a leader in electrical conductivity and water separation measurements instruments for the petroleum industry.  Their testing instruments are used for different ASTM tests :

D 2624
Standard Test Method for
Electrical Conductivity of Aviation and Distillate Fuels
               (Models 1152 and 1153 meters, & 1150 Staticon System)

D 3948
Standard Test Method for
Determining Water Separation Characteristics of Aviation Turbine Fuels
by Portable Separometer
(Microsep® – Model 1140 – Alumicel® coalescer)

D4308
Standard Test Method for
Electrical Conductivity of Liquid Hydrocarbons

D4860
Standard Test Method for
Free Water and Particulate Contamination in Mid-Distillate Fuels

D7224
Standard Test Method for
Water Separation Characteristics by Kerosene Type

D7261
Standard Test Method for
Determining Water Separation Characteristics of Diesel

D6426
Standard Test Method for
Determining Filterability of Middle Distillate Fuel Oil

D6824
Standard Test Method for
Determining Filterability of Aviation Turbine Fuel