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I use these daily in my job at an engineering works and have learned their usefulness and limitations. The accuracy is stated is 0.1 degree with a resolution of 0.1 degrees. In practice the error is typically seldom better than 5mm over a metre when checked against the laser. That is still probably good enough for what you are using it for but I would advise caution if you ever intended to use it as a reference in making something of size where accuracy is required.
2c
Oh, and that 0.1 degree is zero error at plum.... there is often a further 0.1 degree of linearity run out so it will reliably get you to within 0.3 degrees (which is 5mm per m) but I wouldn't trust it beyond that if my life depended on it.
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