The Instant Pot sous vide temperature settings are not as precise as an immersion circulator. The temperature can be off by a few degrees. Once the Instant Pot beeps saying it's reached the desired temperature, I recommend testing the water temperature with a digital thermometer and adjusting the desired temperature accordingly. So if the actual water temperature is 5 degrees lower, increase your desired temperature by 5 degrees. In the future use this adjustment when you're programming the Instant Pot.