Hi, thanks for your question!
Oregon Scientific says on their website they do not carry extra instruction manuals and refers customers to the manufacturer's customer service page. Here is their contact information:
They could most likely send you a manual via email or have one mailed to you. Unfortunately this manual is not available online for free, however this is a website that has a manual for the P316FM (you list PM, so not sure if this is a noticeable difference in product). They charge $9.99 and can email that manual to you. Here is their website:
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