Range: ppb: 0 ~1999ppb ppm: 0～1.99ppm 2. Resolution: ppb: 1ppb ppm: 0.01ppm 3. Accuracy: ppb: ±10ppb ppm: ±0.02ppm 3. Automatic temperature compensation: 0℃～50℃ 4. Working temperature: 0℃～50℃ 5. Battery: 2×1.5V (AAA Batteries) (not included) 7.
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