Hanna Checker - Alkalinity Biofilter these come with 12" pigtails

these come with 12" pigtails for use with batteries

Mount these sensors up to 150 feet away from the auto dialer

Two year warranty on compressor

Pre-wired for optional solar charger

Knobs and barbs are plastic

Hanna Checker - Alkalinity Biofilter these come with 12" pigtailsHanna Checkers are small, handheld colorimeters that provide higher accuracy results than typical chemical test kits. Offering improved technology, these portable colorimeters make measurement hassle free with their simple design and easy to follow instructions. Features at a glance: Easier to use and more accurate than chemical test kits Dedicated to a single parameter Small size, big convenience Ideal for: Aquaculture & Aquariums, Water Quality