Unsure if this is what you are looking for, as question is in Toys forum.
http://www.testequipmentdepot.com/sperry-instruments/pdf/cs550a.pdf
All you need to do is do a search with the model number on this manual site.
https://searchmanuals.net/search8/?keyword=%2Binstructions&gclid=EAIaIQobChMItreT0dnu4QIViIbACh0xwA5XEAMYASAAEgIek_D_BwE#
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