When it is required to make a measurement at a node of an RF circuit, connecting to the circuit using a normal oscilloscope probe, even on the x10 setting can change the behaviour of the circuit. For those difficult cases, you need a special, high impedance and low capacitance, probe like Im selling here. Also you can notice PCB capacitor in series of the input of probe. That capacitors help windstand high DC voltage on the input. This lot includes assembled and well tested RF probe PCB. It suppose to be placed in some tube or enclosure. Even old marker pen will be ok. We ship worldwide from Ukraine by Registered Airmail with tracking number. After package left Ukraine you can track it on Local Post web site. We ship next business day once payment received. Delivery time depends on dest