Disk hardness gauge
From AMS Glossary
disk hardness gauge
"An instrument for measuring snow hardness in terms of the resistance of snow to the pressure exerted by a disk attached to a spring-loaded rod; a gauge calibrated in pounds per square inch registers the amount of resistance" (Glossary of Arctic and Subarctic Terms, 1955).
Compare Canadian hardness gauge.
Arctic, Desert, Tropic Information Center (ADTIC) Research Studies Institute 1955. Glossary of Arctic and Subarctic Terms. ADTIC Pub. A-105, Maxwell AFB, AL, . 90 pp.