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Measuring PH


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OK newbie here with a problem.

I have ran a hot tub for a few years. Last week I brought a new one along with a Apera PH20 digital PH meter which is well regarded. After calibrating the unit with PH 7 and PH 4 solutions with no problems I believe it is working fine. 

However,  when i use it I get a PH of 8.1.

I have 3 brands of test strips which show 6.8, 7.2, 7.4!!!!

 

So the test trips say OK or low while the calibrated meter shows it is high.

 

Which do I believe?????

 

 

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