This is a 4 pack of 1cc single use Mopeka grease packs
Mopeka Sonic Grease is applied to the sensor face to improve ultrasonic performance.
A pea-sized amount of grease should be placed on the black sensor pad any time swapping tanks to help ensure maximum reading quality.
Note: All sensors are shipped with 1 grease pack. Order this package for use when sensors must be removed from tank frequently, or when grease has otherwise been removed from sensor.