It's not 3 in 1 but it's 2 in 1
Aquarium Electronic Salinity Ph Monitor
and it's cheep $80 i know it's not and a apex or
reefkeeper but still good I have one a year with
out any problems.
http://www.ebay.com/itm/370213142278?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649
my 2c
Ed