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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HANNA HI 774-25 Phosphate Ultra Low Range Checker Reagents (25 Tests)

HANNA HI 774-25 Phosphate Ultra Low Range Checker Reagents (25 Tests)

Product ID: 741232715

Details

Brand
Hanna
Global Trade Identification Number
Manufacturer
Hanna

🌊Ultra low range phosphate detection (0.00-0.90 ppm)

📅Expiration & lot number traceability

⚗️Pre-measured high purity reagents

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Description

⚡ Unlock ultra-precise phosphate insights with zero hassle!

PLUG PLAY CONVENIENCE - Simply add the reagent packet to your sample—no prep needed, just instant results.
PRECISION IN EVERY DROP - Pre-made, high purity reagents ensure fast, accurate phosphate readings every time.
TRACEABILITY YOU CAN TRUST - Each reagent packet is marked with expiration date and lot number for reliable quality control.
TRUSTED BY PROS HOBBYISTS - Top-rated (#509 Aquarium Accessories) with 4.8 stars from 369 users, made in the USA by Hanna Instruments.
DESIGNED FOR ULTRA LOW RANGE - Optimized for detecting phosphate levels as low as 0.00 ppm up to 0.90 ppm—perfect for sensitive aquatic environments.

The HANNA HI 774-25 reagent packets are pre-measured, ultra-pure chemical blends designed for ultra low range phosphate testing (0.00-0.90 ppm) using the Ascorbic Acid Method. Marked with expiration and lot numbers for traceability, these reagents deliver fast, accurate phosphate concentration results in ppb, ideal for aquariums, environmental monitoring, and aquaculture. Compatible with Hanna's Phosphate Ultra Low Range Checker HC, they are a trusted choice with high customer ratings and USA manufacturing.

Specifications

ASIN	B07SN7NSHP
Best Sellers Rank	#10,388 in Pet Supplies ( See Top 100 in Pet Supplies ) #546 in Aquarium Accessories
Brand Name	Hanna Instruments
Country of Origin	USA
Customer Reviews	4.8 4.8 out of 5 stars (379)
Global Trade Identification Number	00860012631049
Manufacturer	Hanna Instruments
Model Number	HI774-25
Part Number	HI774-25

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