(c) Custom blending devices where the blending occurs after the measurement of the products shall be inspected and tested for accuracy according to the procedures set forth below.

1. (1) Allow 10-second drain period each time test measure is emptied. To determine proper operation of totalizers, observe and record the totalizer indications before and after all test drafts.

2. (2) Test at lowest octane. Set selector control so that lowest octane product is dispensed. Normal test - full flow - basic tolerance.

   If the first test is well within tolerance, proceed to paragraph (3) of this subdivision; otherwise repeat this test.

3. (3) Check computed price on both sides of dispenser.

4. (4) Test at highest octane. Set selector control so that highest octane product is dispensed. Normal test - full flow - basic tolerance.

   If test is well within tolerance, proceed to paragraph (5) of this subdivision; otherwise repeat this test.

5. (5) Check computed price on both sides of dispenser.

6. (6) Test at blend - select an intermediate blend. Special test -slow flow - basic tolerance.

   If test is well within tolerance and the error is less than or equals the average error of the previous two tests, proceed to paragraph (7) of this subdivision; otherwise slow flow test at first grade above lowest octane and first grade beneath highest octane (where applicable).

7. (7) Check computed price on both sides of dispenser.
8. (8) Set money-value computation on other blends. Set selector control at each of the remaining blends and dispense one indicated gallon to check computed price.