Check the listing for details. Tektronix A6303 High Current DC-15Mhz Current Probe for AM503 Current Probe Ampl. Condition: Used. Listed at 260.00 USD. At $260 BIN, I shall send you a tested, working well, A6303 probe, which can handle upto 100A. Probe needs an AM503 (or A or B) Amplifier Plugin and a TM500 series power frame (sold separately). Probe cost $1100 new from Tek in 1987, which was 5x more valuable then (adjusted for inflation). Calibration should be done on ensemble as a system, and most adjustments are in the AM503. Please make sure Ebay has your correct ship-to address before you pay. Correcting mistakes after you pay is costly as I cannot offer refunds but only store credit. I ship worldwide. Ebay requires I requires I ship with a carrier that provides tracking & delivery confirmation (to address on file at time of payment), which Airmail cannot provide internationally, and rules them out for outside US. Ebay is now required by many of the 50 States to collect sales tax (may spread to all), and I have no control over that & I do not collect sales tax on my own out-of-California sales. INCENTIVE: after you buy any item from me, I will offer you 13% discounts on subsequent item(s), and no tax if you are outside California.