Cheap RH Meters for buckets

[caregiverken]

I found some digital ones for just under 5 bucks each
and I have a few of those already..
But, I want to put them in every bucket for the cure
So I need like a Dozen of em..Do they make an analog one for less $ ?

Any sugestions ?

 

[Haggardass]

http://pages.ebay.com/link/?nav=item.view&id=190851864733

 

[Haggardass]

I bought five of those, they work the way they should they are all within two or three percent most within one, idk if I'm allowed to post that link or not if not sorry and please delete.