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.

ASIN	B07SN7NSHP
Brand	Hanna Instruments
Brand Name	Hanna Instruments
Container Type	Bag
Country Of Origin	USA
Customer Reviews	4.8 out of 5 stars 366 Reviews
Global Trade Identification Number	00860012631049
Item Form	solid powder
Item Weight	0.03 Kilograms
Manufacturer	Hanna Instruments
Package Information	Bag
Unit Count	1 Count

Hanna Instruments HI774-25 Phosphate Ultra Low Range Checker HC Reagents (25 Tests) by wwG Store

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