Hi everyone, i have a Perkins MM that i got maybe 2/3 months ago. it was working fine until the cold weather. if i measure wood that i have inside the house it works ok, i measure my palm its at 30 but when i am out side in the cold if i measure the outside of a split it reads ok but when i split the split in half and measure everything i measure is at 19.9, even my palm, i split green oak log i had ut up a week ago it measured 19.9 i tried a new battery same readings when cold. any ideas