Ducks eggs that are slow to develop

What’s the best way to calibrate them? They are all digital with no probes
Mine are digital too. I put mine in sealed Ziploc bags, and submerge them in a tall cup mostly full of crushed ice and a bit of cold water. Not much water though. Give them at least 10 minutes, check, and if at 32 you can take them out. If not, leave them longer. 30 minutes at most. If they won't go down to 32 try the ice bath again. If it won't go to 32 I'd discontinue using it. Only use ones that go down to 32.
 

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