ARES 70214-3/8-inch Drive Beam Torque Wrench - 0-800 Inch/Pounds and 0-90 Newton/Meter Torque Wrench - High Visibility Markings for Easy Readings

You can buy a basic needle type torque wrench for lb-ins for only $30. Here is what most private firearm armorers end up with: https://www.amazon.com/dp/B07DP6ZS7G?th=1