The verdict is 5.97.. So this dry meter is trash..Do you still have some distilled water? If so gingerly scoop 2 gently packed Tbsp of soil out of the pot and mix it with 4 Tbsp distilled water and let it sit for 20 min or so, stirring here and there. Then use a calibrated digital meter and stick it in the slurry to get a reading.
What tools exactly do you have to work with?