The main unit is around 3yrs old. The lab grade PH probe is less than 6months old and recently calibrated. I will include the wxm and the netgear wireless adapter.
Asking $300 firm. Located at San Francisco
They still sell the apex classic which is no difference than this one.
They also have a newest apex that comes with a lot more stuff.
U can read all about it here https://www.neptunesystems.com/
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