Check the listing for details. HP 545A - HP 546A, Probe-Pulser Combo Gen. 2. Condition: Seller refurbished. Listed at 199.67 USD. HP 545A Logic Probe, HP 546A Pulser Combo Gen. 2In their life time these probes have undergone 3 minor revisions mainly in the cosmetic department, all revisions are functionally identical.This item has been fully tested and has undergone extensive checks without errors.They are both well within original manufacturers specifications and in good to excellent cosmetic condition. Please refer to the photographs,The probes come with 2 additional complimentary grabbers ( in case of loss or damage of the original ones)I will include user and service manuals on either a USB memory stick or a CD. In addition the USB or CD will contain lots of information on all other HP Probes and associated logic devices.I urge all potential buyers to compare my prices and service to any other identical items available elsewhere. Keep in mind availability, international postage, $ exchange rate, and not to forget GST. You will find that what I offer is more than favorableThere are, or will be, other probes and combination of probes available periodically as they become available. If I do not have what you need drop me a line and check back here on a regular basis. I have made it my mission to track down and make available the HP line of probes at tested and affordable priced.If you need something that I don't have drop me a line