Since these will be provided to you as samples directly from a University, it's not quite as easy as buying them from Amazon! There are 3 steps, as shown below. First you'll need to get a brief liability-release form signed (to relieve us of liability), and you'll need to fill out this google form. Once the agreement and this form have been received by us, they will be reviewed and you'll be contacted with a link to the University's online shop where you can then purchase samples: 1 for £100, 4 for £200, and 10 for £300. This fee is to cover our costs, including materials, handling, preparation, and shipping. We add £20 to cover shipping outside of the UK. Each sensor is supplied with a 100mm (4") SMA lead. In applications over 300V, you will need to insulate the connector on the sensor with an appropriate sealant to meet your country's creepage requirements. We include some high voltage sealant in the pack.