There's another brand in another active thread today. About $275 for the monitor and two sensors, and replacement of the batteries in the sensors costs $35 each (return to company, not user serviceable). Accuracy is listed at +/- 3% of full scale, and full scale is 120 psi, so that sounds a lot like +/- 4 psi. Whoop de doo doo.
Install a center stand on the bike so you can pop it on the stand whenever and wherever you want to check the air pressure, then rotate the wheel by hand until the valve is in a handy location. Haul out your $30 hand held gauge with the +/- 1 psi accuracy, apply to the valve, and read the pressure. As noted by 2lane, take this opportunity to inspect for foreign objects in the tire, splits/cracks, bulges, and any other abnormal conditions. Spend your time in the saddle looking at the road and surrounding idiots, not studying a tire pressure monitor.
Jerry