A microphone is enclosed in a semi-sound insulated housing with a jingle bell type device that generates sound in response to a very slight movement andor vibration of the housing andor a structure to which the housing is attached. The snow plow further including a plow blade having a retention apparatus constructed and arranged to slidlingly and disengageably secure the plow blade to the mounting upright when the plow blade is in a working orientation. The method also includes transmitting an infrared light through each one of the plurality of fluid samples at a substantially same time and detecting the infrared light transmitted through each one of the plurality of fluid samples.