A method and an apparatus for testing the leak-tightness of a fuel tank in a vehicle, in which the internal pressure inside the fuel tank is detected, the internal pressure detected is evaluated by weighting this with a value obtained for a change in the speed of the vehicle. As such, the present invention provides a epinephrine injector that may include a locking mechanism, an actuation mechanism, or both, to help prevent the accidental discharge of the injector. On the circuit board are an IC and LED. Thereafter, the hot beverage brewer: automatically detects the brew basket type associated with the brew basket residing within the basket chamber; selects first operations from a plurality of operations that should be performed by the hot beverage brewer based on the brew basket type which was previously detected; and performs the first operations by the hot beverage brewer. The markings produced are radial and non-concentric grooves.