Are nickel metal hydride batteries alkaline batteries?? NiMH?

I bought a damp meter and it says only to use alkaline batteries, I have a rechargeable Nickel metal hydride battery...is this an alkaline battery...? If not what is? Also I bought a battery charger and rechargeable battery by energiser...I presumed they only sold rechargeable batteries suitable for their chargers... show more I bought a damp meter and it says only to use alkaline batteries, I have a rechargeable Nickel metal hydride battery...is this an alkaline battery...? If not what is?

Also I bought a battery charger and rechargeable battery by energiser...I presumed they only sold rechargeable batteries suitable for their chargers but I'm unsure as the charger doesn't say what batteries alkaline or not but my NiMH batteries say to only use in an alkaline charger.
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