Analog temperature probe and digital temperature probe in ExBox2, which one?

[ss162400]

Hello,

you cannot calibrate the digital temperature probe and can trust the measurement since it has only a tolerance of 0.5 deg. celsius.

But which I should trust？and it impact my conduct reading！
In fact, a tolerance of 0.5 deg. Celsius is a Cake, but I concern that the probe is faulty, so causes my conduct reading is wrong!
By the way, I just measured my conduct at 1.024 by GHL probe, but I measured it at 1.028 by Hanna HI96822.
I am confuse! and I just bought the conduct probe from Sewatec Web site.
The analog probe is old for 6 years and the digtal one is new and faulty, which is a disaster for me.
It is important that their readings is not 0, in the measuring cup of the same ice-water mixture.