COMPARISON CHART
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FUEL CELL ELECTROCHEMICAL
METAL OXIDE
GEL CELL
ELECTROCHEMICAL
Long-term stability
Excellent
Poor
Fair
Good
Life
7 Years
10 Years
3-5 Years
3-5 Years
Selectivity
Excellent
Fair
Good
Excellent
Humidity independent
Excellent
Poor
Poor
(unknown with Cap)Poor at
extremes
Temperature dependency to 0F
None
Required
Some
Some
Power required
Low - DC
High - AC only
Low - DC
Low - DC
Cost
Low
Average
Average
High
Digital Display
Yes
Yes
No
Yes