TX Testing Instruments founded in 1993 with 5.6 million registered capital.We specialzing in manufacturing portable hardness tester.The test principle and accuracy of TX hardness testers are all in comply with the requirements of applicable ISO standard. Our products are more superior similar products in craftsmanship and accuracy and have gained great reputation from the customers in many countries. All types of our Rockwell hardness testers have been tested by National Institute of Metrology and the errors are less than 1.5 HR, which meet the requirements of applicable ISO standards.