These are LF-190E, LF-210E and LF-250 by Tecpel Co is an Oscilloscope probe which is designed for wide range of applications. For LF-190E, it has a 60 MHz rating and comprises of item 10 and item 1. The item 1 has a rating of DC~3MHz(+/-1dB) and DC~6MHz(+/- 3dB). The item 10 has a rating of DC~40MHz(+/- 1dB) and DC~60MHz(+/-3dB). The maximum output of LF-190E is 600 VDC. For LF-210E, it has a 100MHz rating and comprises of item 10 and item 1. The item 1 has a rating of DC~6MHz (+/- 3dB. The item 10 has a rating of DC~60MHz (+/- 1dB) and DC~100MHz( +/-3dB). The maximum output for this model is 600 VDC. For LF-250, it has a maximum input voltage of 600 VDC for both item 1 and item 10.