JMT - 628
PROCTOR NEEDLES (HYDRAULIC TYPE)
This is identical to Spring Type , except that the penetration pressure on the needle is conveyed through a hydraulic system to a hydraulic pressure gauge. This system permits a greater control over rate of penetration because of better visibility of load indication.
Specification: Comprises hydraulic proctor needle system complete with a pressure gauge fixed at easily readable Angle reading 0-70kg. x 2 kg. A set of needlepoints consisting one each 0.25, 0.5,1.0,1.5,2.0,3.5, and 6.0 sq.cm. And a Tommy pin. Graduation at every 12.5mm to indicate depth of penetration is marked on longer stem for use with needles of larger areas. Smaller stem is also graduated at every 12.5mm and is used with needles of smaller areas. Complete as above in a wooden carrying case...