This accessory eliminates errors caused by the hydrometer adhering to the side of the hydrometer jar. Loosely self-centering, this device dramatically reduces the time needed to obtain accurate readings, especially in outdoor conditions and for inexperience personnel.

Developed with Dave Colrud, an Alaskan fuel Q.C. expert for use in all conditions. Tested by a top laboratory to confirm that it causes no error.

Precision machined, fuel resistant, high-density plastic.