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A liquid sprayer is provided. This liquid sprayer comprises a bottle having an opening and a sprayer housing attached to the bottle. This sprayer housing includes an electric motor, a voltage source for powering the electric motor, a pump driven by the motor, a switch for completing an electrical ci

A liquid sprayer is provided. This liquid sprayer comprises a bottle having an opening and a sprayer housing attached to the bottle. This sprayer housing includes an electric motor, a voltage source for powering the electric motor, a pump driven by the motor, a switch for completing an electrical circuit, a nozzle mechanism attached to the sprayer housing for spraying a liquid. The liquid sprayer also comprises a venting mechanism. This venting mechanism comprises a vent housing having an inner surface and an outer surface, and a translating piston disposed in the vent housing.

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A liquid sprayer is provided. This liquid sprayer comprises a bottle having an opening and a sprayer housing attached to the bottle. This sprayer housing includes an electric motor, a voltage source for powering the electric motor, a pump driven by the motor, a switch for completing an electrical ci

A liquid sprayer is provided. This liquid sprayer comprises a bottle having an opening and a sprayer housing attached to the bottle. This sprayer housing includes an electric motor, a voltage source for powering the electric motor, a pump driven by the motor, a switch for completing an electrical circuit, a nozzle mechanism attached to the sprayer housing for spraying a liquid. The liquid sprayer also comprises a venting mechanism. This venting mechanism comprises a vent housing having an inner surface and an outer surface, and a translating piston disposed in the vent housing. ocessing circuit operable to assign each cell in the OMR calibration symbol a first normalization constant from the look-up table and operable to assign each cell in the scanned OMR a second normalization constant from the look-up table, and the processing circuit thereafter adjusting each decoding parameter for a respective cell as a function of the difference between the first and second normalization constants for the cell. 10. The symbol scanning device of claim 8 wherein each decoding parameter comprises a cell clock determined by dividing a cell count for the cell in the calibration symbol by a constant. 11. A laser scanner for reading optical mark recognition (OMR) symbols, each OMR symbol including a predetermined number of cells with each cell containing a bar or a space, the laser scanner comprising: an optical transmitter operable to generate a scanning laser beam that scans each OMR symbol with a laser spot when the symbol is within a scan window; an optical detector positioned to receive optical energy reflected from each OMR symbol responsive to the scanning laser beam, the optical detector generating a detection signal responsive to the received optical energy; and a processing circuit coupled to the optical transmitter and the optical receiver and adapted to receive a trigger signal, the processing circuit operable during a calibration mode to evaluate the detection signal to decode an OMR calibration symbol, the processing circuit developing a plurality of decoding parameters including a delay time given by the time between the trigger signal going active and the time the detection signal indicates the OMR calibration label was successfully decoded, and the processing circuit operable during a decoding mode the delay time after the trigger signal goes active to apply the decoding parameters to evaluate the detection signal and decode scanned OMR symbols. 12. The laser scanner of claim 11 wherein the laser spot has a variable spot velocity across the scan window and the processing circuit operates to adjust each decoding parameter to compensate for the variable spot velocity of the laser spot prior to the decoding mode of operation. 13. The laser scanner of claim 12 wherein the processing circuit adjusts each decoding as a function of the position of the scanned OMR symbol in the scan window relative to the position of the successfully decoded OMR calibration symbol in scan window. 14. The laser scanner of claim 11 wherein each symbol is moving relative to the optical transmitter. 15. The laser scanner of claim 14 wherein each symbol moves at a variable velocity relative to the optical transmitter. 16. The laser scanner of claim 11 wherein the optical detector comprises a photo diode. 17. A scanning system for reading optical mark recognition (OMR) symbols, each OMR symbol including a number of cells with each cell containing a bar or a space, the system comprising: an object detector operable to detect the presence of an object and generate a trigger signal indicating whether an object is present; an optical transmitter operable to generate a scanning laser beam that scans each OMR symbol with a laser spot when the symbol is within a scan window; an optical detector positioned to receive optical energy reflected from each OMR symbol responsive to the scanning laser beam, the optical detector generating a detection signal responsive to the received optical energy; and a processing circuit coupled to the optical transmitter, optical receiver, and the object detector, the processing circuit operable during a calibration mode to evaluate the detection signal to decode an OMR calibration symbol, the processing circuit developing a plurality of decoding parameters including a delay time given by the time between the trigger signal going active and the time the detection signal indicates the OMR calibration label was successfully decoded, and the processing circuit operable during a decoding mode the del