Scoville scale
The seemingly subjective perceived heat of hot sauces can be measured by the Scoville scale. The Scoville scale number indicates how many times something must be diluted with an equal volume of water until people can no longer feel any sensation from the capsaicin. The hottest hot sauce scientifically possible is one rated at 16,000,000 Scoville units, which is pure capsaicin. An example of a hot sauce marketed as achieving this level of heat is Blair's 16 Million Reserve (due to production variances, it is up to 16 million Scoville units), marketed by Blair's Sauces and Snacks. By comparison, Tabasco sauce is rated between 2,500 and 5,000 Scoville units (batches vary) - with one of the mildest commercially available sauces, Cackalacky Classic Sauce Company's Spice Sauce, weighing in at less than 1000 Scoville units on the standard heat scale.