RE- read page 61 please. Press the buttons indicated on that page. Then enter 1.77 for all color values. Then make a reading with nothing under the probe then make a reading with your 1.77 under the probe. According to the manual that is all there is to calibrate it.
Then read the strip as in page 19 to see that it reads 1.77 and you know it is calibrated. Use status A and BLACK channel for all your readings.