H endorsement: placarding, shipping papers and the segregation table.
Most Hazardous Materials questions are the same federal material in every state. One question in the app is written for Wisconsin alone, from the Wisconsin Commercial Driver's Manual (Wisconsin information section and Section 10).
The first H endorsement is coordinated with the CDL expiration, so it can run up to five years. Every later renewal is four years, with fingerprinting, a knowledge test, a medical card and proof of legal status each time.
One example, answer shown. Practicing the rest happens in the app.
Table 2 materials need placards once the aggregate gross weight, including packaging, reaches 1,001 pounds. Table 1 materials must be placarded in any amount.