SPER Scientific Meters D.O. Pen

SPER Scientific Dissolved Oxygen Pen, 180 X 40 X 40mm, 0 To 20mg/L Range, 0 To 50c/32 To 122f Temperature Range, Maximum 80% Operating Rh, Dual Lcd Display, Aaa Battery, 175g Weight, With Belt Loop, Two Spare Probe Heads, Electrolyte, Carrying Case, Easy To Carry, Simple To Calibrate, Determine Water Quality In Environmental Testing, Labs, Industrial And Municipal Waste Water, Aquariums And Fish Hatcheries, Simple One Hand Operation With Automatic Temperature Compensation And Calibration To Air, Holds The Current Displayed Reading, Ip67 Waterproof - SPER