Zoo Med T8 ReptiSun Terrarium Hood Size:20" This rehydrates the calibration disc

This rehydrates the calibration disc to its original specs and calibration standard and will provide the most accurate readings going forward

Sponge Diameter: 2

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Zoo Med T8 ReptiSun Terrarium Hood Size:20" This rehydrates the calibration discThe ReptiSun Terrarium Hoods are low profile hoods designed to hold one T8 size linear fluorescent lamp. The ReptiSun Terrarium Hoods feature a built in reflector which allows for deeper penetration of visible light and UVB into your terrarium. Convenient on off switch. The 30 and 36 hoods feature an energy efficient, flicker free electronic ballast. Available in the following styles: 20" Holds 18" T8 linear Fluorescent lamp (not included) 30" Holds