This works on two CR2032 batteries which are not included. At first, I had some troubles putting them in, I wondered whether I should use CR2016, but these are obviously too thin. Then it didn't work, the display just blinked. After trying three or four times, inserting both of them simultaneously, it lit normally and started working. However, there is no off button, the backlight goes off after a minute or so, then after some more time the LCD shuts off completely, but it powers on itself if pressure is applied ... so I wonder how long the batteries will last :-/ Can't comment on accuracy, as I don't have anything better. Over a month to Czech Rep.
Not very accurate reading, the higher the pressure the more inaccurate the reading is. Above 3 bar the real pressure difference is 0.2 bar.