SL-OA69 ISO2137 Intelligent Cone Penetration Tester Product Overview The intelligent penetration tester is an innovative patented product with independent intellectual property rights, designed and manufactured in compliance with Chinese national standard GB/T 269-91 and international standard ISO2137 for determining grease and petroleum penetration. Measurement Principle Penetration is a key index for measuring grease viscosity and hardness, representing the depth (in 0.1mm