Higrometr and other 65,000 icons from Icons8 icon pack follow the visual guidelines of the operating systems: Windows, iOS, Android KitKat, and Material. PNG format is free up to 100x100 px. Icons are availble for download in PNG and vector (SVG, PDF, EPS, and more).
The icon is shaped like a tear drop with the bottom half of it covered in dots. To the left of the tear drop shape is a vertical line with 7 smaller connecting horizontal lines facing left. The top, middle and, bottom lines are slightly bigger than the others.