Where there is chemistry questions, Beverly will soon follow... 
I had the same issue a year or so ago.... and when I calibrated and checked against a pH pen, I found the monitor to be out by 0.5 so I was actually running at 7.95 not 8.45... Now I calibrate once a month or so and concentrate on alk and ca levels... keeping those parameters in line will usually keep pH around 8.2 - 8.4 unless you have too much c02 in the system...
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135G Mixed Reef. Bullet 2, 25 gal refugium, 2 X250W MH + 4X 96W PC\'s, DIY Calcium Reactor, Coralife 1/6 HP Chiller, Phosban, Tunze, 2 closed loops & SQWD\'s, Seios, Coralife 4 stage RO/DI & a bunch of other expensive gadgets... I may never retire, but I'm gonnahavahelluvanaquarium!
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