The CM-10H compressometer is designed to conduct a breaking strength test. It measures the compression strain on a cylindrical concrete specimen (10 cm in diameter x 20 cm in length) made of generally used concrete or high-strength concrete. The high-sensitivity strain gauge is assembled into this compressometer to measure the amount of strain. Both the high-sensitivity strain gauge and a cylindrical concrete specimen are provided with coverings to protect them from damage. A cylindrical concrete specimen can be set in the compressometer quickly and easily. This compressometer allows the strain on a wet concrete specimen, taken out right after underwater curing, to be measured. With this compressometer linked with either the CLL-NA or CLH-MNA load meter, it is also possible to measure the modulus of static elasticity.