Editing Lubavitch Shechita (section)

===== Various Requirements in Checking the Knife =====
Regarding checking the knife, there are various instructions, some appearing in halacha, some customary among shochtim, and some are enactments added in our generation:

To immerse in mikvah before checking the knife, to check with a settled mind, to check slowly, to check only when hand temperature is average, not to check the knife after checking lungs, to wash the knife before checking it, not to check when the shochet is tired even slightly, to check specifically with the fingernail, to check without gloves, to check from every nick even at its beginning and end, not to check in front of a fan, to check under the authority of the rav, and more.