There certainly a wide choice now, I think the first link Dave is a bit bulky for use up a ladder or on a roof, seems that more compact models around now, also the versions that can identify Astra 2 series over other Sats look favouriteFor satellite alignment I use one of these 3.5" Color LCD Digital Satellite Finder Signal Meter | eBay UK
There are several sellers offering those on ebay, that is the first one I found today, not necessarily the cheapest one. Mine came from a seller in Hong Kong. There are also two other versions of that, clearly the same works but in a different package both worth considering as well.
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