The rubber hardness tester LX-J can be equipped with different fixed load weights, specifically designed for clamping LX-A, LX-D Shore hardness testers and LX-C microporous material hardness testers to measure hardness values. The test setup includes a push handle, a fixed load weight, an adjustable glass worktable, a hardness tester clamping cross arm, and a lifting column, which can conveniently and accurately measure hardness values.