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

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

Product ID: 293998212

Details

Brand
Hanna
Item Form
solid powder
Item Weight
0.03 Kilograms
Manufacturer
Hanna
Package Information
Bag

📅Expiry & lot traceability

🧪High purity chemicals

⚗️Pre-measured precision

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Sold byAmazon ThailandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚡ Measure Ultra-Low Phosphate Like a Pro — No Lab, No Hassle!

PURE CHEMISTRY - Formulated with high purity chemicals ensuring consistent, contamination-free results every time.
TRACEABLE QUALITY - Each reagent packet is marked with expiration date and lot number for full accountability.
EFFORTLESS ACCURACY - Pre-measured reagents eliminate guesswork for fast, reliable phosphate readings.
ULTRA LOW DETECTION - Detect phosphate levels as low as 0.00 ppm with precision tailored for sensitive samples.
PLUG PLAY CONVENIENCE - Simply add the reagent packet to your sample and get instant colorimetric phosphate concentration.

The Hanna Instruments HI774-25 reagent packets provide 25 pre-measured, ultra-low range phosphate tests using the Ascorbic Acid Method. Designed for use with the HI774 Checker HC, these high-purity chemical reagents deliver fast, accurate phosphate readings from 0.00 to 0.90 ppm. Each packet is traceable with expiration and lot numbers, ensuring reliable and consistent water quality monitoring.

Specifications

ASIN	B07SN7NSHP
Brand	Hanna Instruments
Brand Name	Hanna Instruments
Container Type	Bag
Country Of Origin	USA
Customer Reviews	4.8 out of 5 stars 370 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

Reviews

B**6

Correct Replacements

25.09.2025

J**Z

Producto de calidad

Buenos producto

15.03.2026

P**E

Constantly correct

3.03.2026

J**R

very good

12.09.2025

F**E

Good stuff

26.01.2025

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