The Lowes link you provided appears to be a microwave type oven. It is listed at $119 and cannot be a really true convection oven that is reliable as true quality microwave comvection ovens run in the $700 range and up. I doubt even then I would ever trust my ball in a microwave oven.
I do my balls in a convection oven at times, but my oven is a regular full size baking oven that all homes have, except it is convection and extremely even heating and controllable. These units run from approx. $1000 - $1500 depending on brand and quality and a double oven with a lower regular oven and a convection upper oven cost approx. $2000 - $2500 depending on brand and quality.
When I take my ball out of my convection oven, it is not hot....only warm and you can comfortably hold it in your hands as long as you want and it won't burn you or be too hot.
To sum it up, I would never put my ball in any type microwave oven, convection or not. Especially one that cost only $119.
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"Whenever I feel the urge to exercise I lie down until the feeling passes away."
Brick