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I cannot comment on the spider...sorry!
However, I am wondering where people get these iSpot cards, which have the measuring scale on the side?
Thanks for any advice.
My Flickr photos...
If you send in a request with your address details to the contact button at the end of the page then we may be able to send you some (not sure how stocks of card are at moment).
Lat/Lng: 49.1005, 14.6764