hygrometers?

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  #1  
Old 05-06-14, 12:11 PM
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hygrometers?

Do hygrometers lose their sensitivity/ability to detect relative soil moisture if left stuck in the ground next to the plant or do they need to be stuck in the ground only when testing the soil at the moment?

Mark
 
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  #2  
Old 05-06-14, 04:46 PM
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That's an interesting question. I have some cheapies lying around. I'll have to stick them in the ground and leave them to see how they do over time. I suspect that since they work with minute electrical currents that long term exposure will cause corrosion and eventually kill them or at least skew the results.
 
  #3  
Old 05-06-14, 07:04 PM
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Now that you mention it, I'll save you the time. The tip does look corroded. Do you think sanding off the corrosion would do the trick or once the thing is corroded it's shot?
 
  #4  
Old 05-07-14, 03:40 AM
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These meters do not measure moisture directly but instead measure the electrical resistance of the soil, which decreases when it is wetter. You can use some steel wool to polish the corrosion from the stem of the instrument.
 
  #5  
Old 05-07-14, 03:44 AM
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I'll try the steel wool this morning.
 
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