If the GD7000 shows oxygen in increments of 0.1%VOL, does that mean the error is also ±0.1%? No. Resolution is the interval the display can distinguish; accuracy describes how close a measured value is to a reference value. The number of decimal places alone does not tell you the measurement error.
Resolution is the spacing between display increments
Resolution is a specification for how finely an instrument divides the displayed values. The public GD7000 materials state an oxygen measurement range and a display resolution of 0.1%VOL. Read 0.1%VOL as the display increment for oxygen concentration. Range and resolution answer different questions: the range is the interval the instrument is designed to measure, while resolution is the size of the steps shown on screen.
Depending on the display method, a true value between two increments may appear at the nearest step. If a change is smaller than the display increment, the displayed number may remain the same. That does not prove the actual concentration did not change at all, and a one-step change does not prove that the true value changed by exactly that increment.
Accuracy or tolerance requires separate evidence
Accuracy describes how closely a measurement result agrees with a reference value. It may be stated with measurement conditions or a range, and sensor characteristics, calibration status, and surrounding conditions can also affect the result. Even if a screen displays several decimal places, the value may still differ from the reference. Conversely, a larger display increment does not mean the error must be that large.
When comparing specification sheets for two products, do not automatically consider the one with more digits on screen to be more accurate. Check resolution, accuracy, and measurement range separately. A single specification value cannot replace the site’s work acceptance criteria either. The document you need depends on whether you need to distinguish a small concentration change or assess error relative to a reference value.
What range and increments say about measurement conditions
The measurement range describes the values the instrument is designed to measure; resolution describes the increments used to display values within that range. A wide-range instrument may display values across more concentration levels, but that alone does not mean its display increments are fine. Likewise, a small display increment does not establish that the instrument accurately measures a wide range. Neither item is evidence from which to infer the other.
The public GD7000 specification gives an oxygen range of 0–30.0%VOL and a resolution of 0.1%VOL. These are separate pieces of information confirmed in the model documentation. For example, if a user wants to distinguish small changes in oxygen readings, the display increment may be relevant. But comparing a measured value with a reference also requires accuracy and its conditions. A small display increment does not tell you the error relative to a reference value.
Resolution alone also cannot determine whether a one-step change on screen reflects an actual change in the air or a variation in the sensor signal. Repeatability, accuracy, calibration status, and measurement conditions may all matter. Avoid confirming a real change solely because the display moved by one step, or concluding that there was no change because the displayed value stayed the same. A specification helps interpret what you observe, but one item does not assess the overall quality of a measurement result.
Do not calculate an accuracy figure from display increments when the public document does not provide one. Explain what you need to establish and separately ask whether an official GD7000 accuracy specification is available. Comparing the definitions and evidence for each specification is more reasonable than assuming a model that displays more digits is more accurate.
The performance detail you need also depends on the measurement purpose. If you want to observe changes in oxygen during work, the minimum display increment may be the first item you notice. If you need to compare results with a particular reference, evidence about how closely the indicated value agrees with that reference is important. Two users looking at the same 0.1%VOL display may be asking different performance questions: one wants to know whether small changes can be distinguished; the other wants to know how much error may be present.
Even a finer resolution cannot support comparison with a reference if its accuracy conditions are unknown. The display increment tells you about visible steps; it does not include the difference from a calibrated measurement reference. Check not only the unit beside a value on the specification sheet but also the name of the item and the conditions to which it applies. Clearly identifying what you need avoids mistaking decimal places for an error figure.
Tell AI Safety Korea Co., Ltd. what oxygen range and change size you need to observe with the GD7000, and ask separately about the published resolution and accuracy information.
Ask About GD7000 Measurement Specifications