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The MiniBump Tester from ACD is specifically designed for applications where 'bump' testing is required or recommended. The MiniBump Tester generates a puff of gas to check an instrument?'s response and alarms. Available for chlorine, hydrogen, hydrogen cyanide and hydrogen sulfide, the MiniBump Tester provides up to 1000 tests for each field-replaceable generating cell. The MiniBump also has an optional BumpStation wall mounting housing to make a fixed bump test station. Electro-chemical cells are not included and must be ordered separately. The MiniBump gas generator uses only two "AA" alkaline batteries and easily fits inside your shirt pocket or on your belt between tests of your detection system. The MiniBump gas generator is also extremely cost effective. The field-replaceable electro-chemical generating cell costs about as much as a disposable cylinder, but provides up to 1000 tests.