Review on Reddragon Humidity Testing Moisture Detector - Building Measurement & Inspection by Nelson Calafell

I've had this unit less than a week. It read the moisture content of my firewood stack on about 50 pieces of wood. Then only zero is displayed, no matter what setting I set. However, I was able to determine the moisture content of my finger, which was around 26%. Not very useful for my wood burning needs. And of course I need a moisturizer. I took out the batteries and replaced them. I changed the settings to every possible option and couldn't get any readings other than ZERO unless I had it on my arm. I have set this counter to ZERO.