it says expiration date 5/2021 , are they still usable?

Probably, they are dry reagents. I would suggest ordering a new batch, comparing tests, and then decide.

So just to confirm hi774 is the same as hi736?

Hello hi774 is NOT the same as hi736. HI774-25 is designed to be used with samples that have an expected range of 0.00 to 0.90 ppm phosphate. HI736-25 is designed to be used with samples that have an expected range of 0 to 200 ppb phosphorus.

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🧪 Stay ahead in water quality with precision you can count on!

READY WHEN YOU ARE - Convenient 25-test packs keep your water analysis streamlined and efficient.
EFFORTLESS ACCURACY - Pre-made reagents ensure consistent, reliable phosphate readings every time.
VERSATILE APPLICATION - Ideal for aquariums, environmental studies, aquaculture, and water quality management.
TRACEABILITY YOU CAN TRUST - Each reagent batch is marked with expiration dates and lot numbers for full quality control.
ULTRA LOW RANGE SENSITIVITY - Detect phosphate levels at ultra low concentrations, perfect for pristine water monitoring.

HANNA HI 774-25 offers 25 pre-made ultra low range phosphate reagent tests, crafted with high purity chemicals and marked for expiration and lot traceability. Designed for professionals managing aquariums, environmental water, aquaculture, and quality control, it delivers precise phosphate detection to keep your water monitoring accurate and hassle-free.

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