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)

Product ID: 741232715

Details

Brand
Hanna
Global Trade Identification Number
Manufacturer
Hanna

💧Ultra low phosphate detection (0.00-0.90 ppm)

📅Expiration & lot traceability

⚗️Pre-measured high purity reagents

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Description

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

VERSATILE APPLICATION - Ideal for aquariums, environmental monitoring, aquaculture, and water quality management.
PRECISION IN EVERY DROP - Pre-made reagents ensure fast, accurate phosphate readings without guesswork.
EFFORTLESS COMPATIBILITY - Specifically designed for use with the Hanna HI774 Ultra Low Range Checker HC for seamless testing.
TRACEABILITY YOU CAN TRUST - Each reagent packet is marked with expiration date and lot number for full quality control.
ENGINEERED FOR ULTRA LOW RANGE - Detect phosphate levels as low as 0.00 ppm, perfect for sensitive aquatic environments.

The HANNA HI 774-25 reagent packets provide pre-measured, ultra-pure chemicals designed for ultra low range phosphate testing (0.00 to 0.90 ppm) using the Ascorbic Acid Method. Marked with expiration and lot numbers for traceability, these reagents deliver fast, reliable results when used with the Hanna HI774 Ultra Low Range Checker HC, making them essential for aquariums, aquaculture, and environmental water quality monitoring.

Specifications

ASIN	B07SN7NSHP
Best Sellers Rank	#4,317 in Pet Supplies ( See Top 100 in Pet Supplies ) #150 in Aquarium Accessories
Brand Name	Hanna Instruments
Country of Origin	USA
Customer Reviews	4.8 4.8 out of 5 stars (385)
Global Trade Identification Number	00860012631049
Manufacturer	Hanna Instruments
Model Number	HI774-25
Part Number	HI774-25

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