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.

Hanna Instruments Hi774 25 Phosphate Ultra Low Range Checker Hc

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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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Description

🧬 Unlock pristine water clarity with precision you can trust!

TRUSTED BRAND - Hanna Instruments’ USA-made reagents backed by 4.8-star reviews and industry expertise.
TRACEABLE QUALITY - Each packet marked with expiration date and lot number ensures consistent, trustworthy results.
EFFORTLESS ACCURACY - Pre-measured reagents eliminate guesswork for fast, reliable phosphate readings.
ULTRA LOW SENSITIVITY - Detect phosphate levels as low as 0.00 ppm, perfect for pristine aquariums and sensitive environments.
VERSATILE APPLICATION - Ideal for aquariums, aquaculture, environmental monitoring, and water quality testing.

The HANNA HI 774-25 reagent packets provide 25 pre-measured tests designed for ultra-low phosphate detection (0.00 to 0.90 ppm) using the Ascorbic Acid Method. Made in the USA with high purity chemicals, each reagent is marked for expiration and lot traceability, ensuring reliable and fast phosphate measurements ideal for aquariums, aquaculture, and environmental water quality monitoring.

Reviews

B**E

Hanna Phosphates Reagent Refill

For use with your Hanna Phosphate checker. This is the one I have to do often to keep phosphates under control or catch them before they become an issue. Fair pricing for a good and accurate product.

2.10.2026

M**O

Love it

Best tester ever ! reagent is on point most of the time it’s off ,there dirt on the glass

20.07.2026

C**S

Phos testing powder

Works good as described

14.07.2026

D**I

Buying was quicker than the online stores

Good dates. Came well packaged.

3.08.2026

D**G

Test every few days.

I got all of the Hanna testers. No need to try to determine colors.

1.04.2026

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