Specifications

(The G-type Standard Test Blocks (STB) are a series of test blocks containing flat-bottom holes and are used in straight beam (normal) testing. They are used to adjust the working sensitivity, to measure the characteristics of the normal beam probe, and to measure the overall performance characteristics of the ultrasonic test equipment. All versions are offered, including the STB-G V2, V3, V5, V8, and six V15 blocks. Each block contains a unique metal-travel distance, flat-bottom hole diameter, and overall block size.)

JIS-STB-A1
Standard Test Block(STB) Type A1 is used for adjusting the working sensitivity,test range and for the measurement 
of characteristics of angle probe,refraction angle and probe index of angle probe.
In accordance with Japanese Industrial Standard JIS Z 2345
1018 Carbon Steel
Size:25mm×100mm×300mm

JIS-STB-A2
Standard Test Block (STB) Type A2 is used for adjusting the working sensitivity and for the measurement of overall performance characteristics of test equipment. STB types A21 and A22 are also available.
Made from 1018 Steel.
Spec: Japanese Industrial Standard JIS Z 2345 Figure 4
Block Size: 15 mm x 150 mm x 300 mm

Standard Test Block (STB)
Standard Test Block (STB) Type A3 is used for adjusting the working sensitivity and test range, and for the measurement of refraction angle and probe index of angle beam transducers. STB types A31 (Fig. 8), A32 (Fig. 9), and A7963 (Fig. 10) are also available.
• Made from 1018 Steel.
• Spec: Japanese Industrial Standard JIS Z 2345 Figure 7
• Block Size: 15mm x 45.5mm x 130mm