How are the $500-$900 or so ones on amazon like this: https://www.amazon.com/dp/B006H8JNKC/

This oven is a total waste of money for a knife maker.

Here are the problems with it:

• Temp ranges up to 550⁰F/285⁰C - useless for anything except tempering and a $20 toaster oven will hit those temps just fine (though it may not be accurate or consistent)

• Size is too small and wrong shape - 12" wide, 10" tall and deep. OK, it's big enough for what most people typically make, but the absolute longest blade is gonna be less than 18½ inches

The heat treat ovens are expensive because they are:

• The right shape (longer and narrow)

• Consistent and accurate

• Can hit temperatures needed for heat treating steel (2000⁰F or 800⁰C is really hot)