Two engraved thermometers mounted on a plastic base with a water reservoir. Humidity chart included. Place blue base flat on incubator floor. Fits most incubators. This is the wet bulb/dry bulb technique. Includes wick. Replacement wick item number WK1
WK1 - 7/16" Fits RX2, TX7, DT3018 and HAHT. Sold by the foot - enter a 1 in the box beside 1 foot, 2 feet, or 3 feet, then select size WK1 or WK2 from the pull down menu.