Identify a component

[SpaceNoun]

hello,
I'm trying to identify this component, by it's a mystery!! Infinite resistance, not a capacitor and when I test it with a T7 or with a multimeter I measure 620 mV like a diode!
Can someone help me, because I need to replace it on an other board that was corroded?
Thanks by advance

[harp]

Looks like low value capacitor (pF), you have it again on right side of photo also... if it is between power rail and ground. Some measuring device have trouble while measure that low capacitance out of circuit, and in circuit measurement has no sence at all. If it is on some power rail, then that shape and color may be a fuse, or blown fuse.

[lotas]

It could also be varistors.

[SpaceNoun]

harp bingo, it is indeed a low value capacitor. I tested with a good capacitance meter, measured at 20 pF.
Thank you both for your answers.