RS Pro Passive Oscilloscope Probes - RS-MF Series. RS Pro Passive Oscilloscope Probe RS-MF Series. Ergonomically designed probe suitable for use with all major brands of oscilloscopes as well as our range. RS Pro passive oscilloscope probes don't require a power supply or batteries so are lightweight and easily portable. Probe Options. RS - MF 312 = RS stock no: ; 146-6616 146-6616. RS - MF 312-2-6 = RS stock no: ; 146-6617 146-6617 (2 pieces RS – MF 312). Attenuation Ratio. 1:1 max. Input voltage 400 V CAT I (VDC + Peak AC) derating with frequency 10:1 max. Input voltage 600 V CAT I (VDC + Peak AC) derating with frequency. Contents. MF Oscilloscope Probe Protective caps BNC adapter Spring hook tip Spare probe tip Grounding lead terminated with insulated crocodile clip Trimmer tool