A thermal printhead includes an insulating substrate, a glaze, a plurality of pairs of first and second electrodes and heating resistors. The testing device includes a protective casing, a second circuit board, a second connector and a third circuit board. 25 mm needles enclosed in a housing with a vacuum line and a disposable cartridge having the active agent, the skin-care product or the topical formulation. The brackets are bolted directly onto roof supports via preexisting roof-support bolt holes, or onto the track bar that comes with some specialty roofs. In an optional embodiment, wagers may be received prior to commencement of the game andor at the intermediate point and resolved at the end of the game. The heat pump may perform gas injection through a plurality of coolant injection circuits formed in a compressor, such as a scroll compressor, to increase a corresponding flow rate.