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VWR Benchtop sympHony Meter pH model: SB90M5**This unit has been tested to specifications. Batteries not included. Has slight cosmetic blemishes from normal use. See photos for further detailsThe VWR sympHony SB90M5 Benchtop Multiparameter Research Meter is dustproof and splashproof meeting all the U.S. Pharmacopeia requirements (USP). Features include: automatic or manual pH calibration; automatic buffer recognition of NIST, US, and DIN buffers; waterproof BNC pH electrode and ISE connectors and waterproof mini-DIN locking DO and conductivity probe connectors; automatic or manual temperature compensation; manual ISE calibration; automatic blank correction; automatic barometric pressure compensation; auto-read/hold function; optional GLP IQ/OQ documentation; and point-to-point ISE calibration with High and Low concentration range.Specifications:Dissolved Oxygen Barometric Pressure: 450 to 850 mm HgSalinity Resolution: 0.01Dissolved Oxygen Saturation Resolution: 0, 0.0Resistivity Resolution: AutomaticConductivity Range: 0 to 3000 uSConductivity Resolution: 4 sig. digits down to 0.001 uS/cmDissolved Oxygen Concentration Accuracy: +/-0.2pH Resolution: 0.1/0.01/0.001 (NOT Included)Cell Constant: 0.001 to 199.9TDS Range: 0 to 19,900Additional Prep Fees May Apply