Are the uncertainty specifications at the 1-sigma (68%) or 2 sigma (95%)?

I am performing some uncertainty calculatons on my WT300E series power analyzer. Are these uncertainty specification at the 1-sigma (68%) or 2 sigma (95%)? I would assume 2-sigma but the datasheet doesn't explicitly state this so I would like confirmation.

ANSWER: The WT300 bulletin specifices accuracy, not uncertainty. The specification of accuracy is the 100% guaranteed value under the conditions specified in the data sheet, and if the error of the measured value exceeds the range of accuracy, the product will be the subject to repair. So, there is no implied statistical / distribution in our bulletin’s accuracy specification.

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The WT300 offers high performance and high reliability in a compact package with excellent price value, making it ideal for multiple applications from R&D to manufacturing test. It is the fifth generation of Yokogawa's value series power meter, and the world's best selling power meter.

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Measure characteristics of devices that generate, transform or consume electricity. Also called power meters or wattmeters, these devices measure parameters such as true power (watts), power factor, harmonics, and efficiency.

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