The Schütz Messtechnik borehole probe with sight glass dust and water filter is designed specifically for gas concentration measurement below the ground surface.
This gas measurement probe has a very robust construction that has proven itself over many years.
G10.140: Carbon fiber, 0,46kg
G10.143: Carbon fiber, unscrewable, 0,46kg
G10.147: Steel, 0,60kg
G10.149: Steel, extended tip 50cm or 31cm, 0,60kg