... We sell from manufacturer directly. PG610-O2 oxygen gas detector shell is nonskid, waterproof, dustproof and explosion-proof.Main ... to input password to prevent wrong operation.l Automatic calibration function, reduce the measuring error.l Recover key data ... mm × 60 mm × 24 mmStandard configuration: instrument box, gas detector, specifications, certificate of approval, warranty card, charger, gas hood ...