The Testec TT-LX 312 probe, manufactured by Testec, is a versatile tool with frequency ranges of 10 MHz and 100 MHz, offering 1:1 and 10:1 attenuation options. It is designed for precise signal measurements and is widely used in electronic testing and troubleshooting. The Testec 10120 Probe 1 Set is ideal for use in both educational and professional laboratory settings.