Sounding my 16 mm sounding rod

• 00:01
• 00:08
• 00:15
• 00:22
• 00:29
• 00:36
• 00:44
• 00:51
• 00:58
• 01:05

Sounding with my 16 mm Hegar sounding rod.

• 1,304
• 01:11