Technically speaking, the manual is hearsay evidence since it was written by someone else and they are not in court to testify on the document. That is, no one is there to 'authenticate' the document as having been written by them, not having been altered, etc.
However, you can always employ a 'side-way' evidence strategy so that the JP at least hears the evidence, here's an example of how you can do this:
1) Ask the officer what device they used and if they followed the manufacturer's recommendations.
2) Ask what manual they used to follow such testing on that particular device.
3) Ask whether that manual excerpts you have on you are similar to the manual that the officer read for the device. The answer will likely be ' I don't know' Doesn't really matter at this point.
4) Ask the officer to read the excerpts out loud of the manual you want to introduce.
5) Ask the officer if those statements are the same as the manual for the device.
6) Ask the officer whether what he read is consistent with what he believes the manufacturer's recommendations are.
7) Ask him if there is anything in what he read that is different from the manufacturer's recommendations.
What you've in essence done is never introduced the manual as true for its contents as evidence (since that would be hearsay), but have gotten the content of it on the record anyway and pretty much gotten the officer to corroborate it. Never once do you ask him to verify that the excerpt is the actual manual (since the logical answer will be "I don't know"; thereby negating the weight of such evidence). Instead, you are getting the officer to compare what they have read to what they believe the real manufacturer's recommendations are and literally asked him where (if anywhere) are there differences. In other words, you've gotten the officer to STATE those recommendations to the court; all without introducing the actual manual!!!
You certainly CAN try to introduce the manual as evidence (if the prosecutor gave it you then there shouldn't be any objection). However, if it gets objected to, this is an often-employed runaround strategy.
The JP will then have to evaluate the officer's testimony and will pretty much have to adapt the manufacturer's recommendations read by the officer as being the basis of the officer's testing, etc. and/or lack of testing, even though the actual manual has never been introduced. You can then refer to the officer's testimony regarding the manual in your final submissions and challenge what they did and why such evidence is uncontradicted and therefore should be given enhanced weight. After all, the prosecutor had the actual manual but didn't introduce it or challenge that evidence of the officer in that aspect, even though they had the perfect opportunity to do so!