Good evening everyone, Tomorrow I will be going to get my first (USED) Oscilloscope it is a Gould Advance OS250B, I think the b means its a 15Mhz and without the b its a 10MHZ. It does not come with probes So I order a set of these https://www.amazon.ca/dp/B00D5VAN6M/...088100_TE_item...