The Barcol Hardness Tester meets the following ASTM (American Society for Testing and Materials) standards: E140-97; D2583-75; B648-78: E140-97 Standard Hardness Conversion Tables for Metals; D2583-75 Standard Method of Testing for Indentation Hardness of Plastics by means of a Barcol Impressor; B648-78 Standard Method of Testing for Indentation Harness of Aluminum Alloys by means of a Barcol Hardness Tester. The digital meter offers a wide measuring range, high accuracy and direct display of the measured values on the built-in backlit LCD. Adding to the meter's versatility is its sleek design, allowing for quick and easy one-handed operation. Barcol Hardness Tester, 0 to 100 HBA.