The HexPro Wood Monitors should be changed out yearly.
Each HexPro Wood Monitors measures 1 x 5 x 1/2 inch. The pack of 10 measures 5 x 5 x 1 inch.
HexPro Wood Monitors should be changed at least yearly. Depending on where you live and the climate and amount of rain, you may need to replace the wood base more often. If the wood becomes very soggy and moldy then you should replace them.