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Even better is to cut a wedge of scrap plywood, or chipboard, that has the exact angle calculated by trigonometry, which then can be laid against your OTA, and adjustment made with the assistance of a spirit level. This would be as, or more accurate than an inclinometer, and if you already have a spirit level, would in effect cost nothing.
Not knowing whether you have easy access to trig calculators, this would mean a right angled triangle with a base of 300mm, a vertical of 202.5mm, and a hypotenuse of 362mm, assuming a latitude of 34 degrees.
Regards,
Mike
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