SPER Scientific Digi & Alarm Thermoms Oxy

SPER Scientific Oxygen Pen, 7 X 1-1/2 X 1-1/2 In, 0 To 30% Oxygen Range, 0.1% Oxygen Resolution, 0 To 50c/32 To 122f Temperature Range, 0.1 Temperature Resolution, Maximum 80% Operating Rh, 28 X 19mm Lcd Display, Aaa Battery, 175g Weight, With Belt Loop, Shoulder Strap, Carrying Case, Portable, Simple One Hand Operation, Hold Function, Auto Power Off, Minimum/Maximum, Low Battery Indicator, Atc, Reads Oxygen In Air For Environmental Studies, Iaq, Bio-Technology, Food Storage And Refrigeration And Testing Fire Alarm And Fuel Cell Systems, - SPER