Viavi HP3 chargers

I need a new power supply/charger for my Viavi HP3, what is the part number I need to order?

Depends on the unit serial number. If the middle group of digits is 736x or 736x it uses the older 9v 500ma charger. If the middle group of digits is 865x to 870x then it uses the new 12v charger (FBPP-PS4). Example below: D0610-7363-505                this is a rev 1 HP3 and requires an older 9v 500ma charger D0610-8651-505                this is a rev 2 HP3 and you can use FBPP-PS4, 12vdc charger