The part temp is the important thing for curing powdercoat. Use the handheld thermometer to shoot the temp of the part. Use the digital thermometer that is reading air temp in the oven as a guide to set the oven control or thermostat. The mass of the part you are powder coating will determine how long it takes to get to curing temp. My 4'x6'x6' oven will reach 450 degrees air temp in 7 minutes if it is empty, but takes about 15 - 20 minutes to ramp the part temps to 400 degrees if it is full of parts. You need to experiment and keep records to find how long it takes your oven to get the items to temp. Hope I didn't muddy it up too much for you.
Leo
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