Fondriest Environmental pH 4 Calibration Buffers

Fondriest Environmental offers a full line of pH 4 calibration buffers in pint, quart, 1-gallon,and 5-gallon containers.

Features

  • +/-1% accuracy with NIST traceability
  • Pre-mixed and ready to use
  • Temperature compensation scale
Starting At $14.85
Stock 3AVAILABLE
Questions & Answers
Can the pH buffer solutions be used for sensor calibration after being frozen?
No. The pH solutions should not be used for calibration after freezing and should be discarded.
Did you find what you were looking for?

Select Options

  Products 0 Item Selected
Image
Part #
Description
Price
Stock
Quantity
Fondriest Environmental pH 4 Calibration Buffer
FNBU5004-P
pH 4 calibration buffer, 500mL bottle
Your Price $14.85
3 Available
Fondriest Environmental pH 4 Calibration Buffers
FNBU5004-Q
pH 4 calibration buffer, 1L bottle
$22.64
Check Availability  
Fondriest Environmental pH 4 Calibration Buffers
FNBU5004-G
pH 4 calibration buffer, 4L bottle
$52.67
Check Availability  
Fondriest Environmental pH 4 Calibration Buffers
FNBU5004-F
pH 4 calibration buffer, 4L cubitainer
$57.72
Check Availability  
Fondriest Environmental pH 4 Calibration Buffers
FNBU5004-10L
pH 4 calibration buffer, 10L cubitainer
$69.91
Check Availability  
Fondriest Environmental pH 4 Calibration Buffers
FNBU5004-T
pH 4 calibration buffer, 20L cubitainer
$126.92
Check Availability  
Fondriest Environmental pH 4 Calibration Buffers
FNBU5004-BP
pH 4 calibration buffer, 20mL pouches, pack of 20
$46.39
Check Availability  
Notice: At least 1 product is not available to purchase online
×
Multiple Products

have been added to your cart

There are items in your cart.

Cart Subtotal: $xxx.xx

Go to Checkout

In The News

Ocean acidification: University of Washington's giant plastic bags help control research conditions

With oceans becoming more acidic worldwide, scientists are getting creative in designing experiments to study them. For example, one group at the University of Washington is using giant plastic bags to study ocean acidification. Each bag holds about 3,000 liters of seawater and sits in a cylinder-like cage for stability. The group at UW, made up of professors and students, is controlling carbon dioxide levels in the bags over a nearly three-week period, during which they are looking at the effects of increased acidity on organisms living near the San Juan Islands. “These mesocosms are a way to do a traditional experiment you might do in a lab or classroom,” said Jim Murray, professor of oceanography at the University of Washington.

Read More

Three Decades of Research at Acton Lake

A multi-disciplinary team at Miami University, Ohio, has been studying the environmental change at Acton Lake for over three decades. Using three different NexSens buoys over this time, the team has an incredible archive of data that is helping build a picture of Acton’s past, present, and future. Until recently, a NexSens CB-50 buoy was used alongside other environmental monitoring at Acton Lake. In May 2025, the Miami team deployed a new XB-200 buoy , future-proofing their ongoing monitoring using real-time buoy systems. Acton Lake, a small hypereutrophic reservoir in southwest Ohio, covers 2.4km² and has a maximum depth of about 8m. The dam was built in 1956, and the lake has a large agricultural watershed.

Read More

Source Water Monitoring in Albany, New York: Tracing Water Quality throughout Tributaries

Thousands of US cities pull their drinking water from natural source waters like reservoirs, rivers, and streams, making overall watershed health a key consideration for water providers. In Albany, New York, the Albany Department of Water and Water Supply delivers drinking water to over 100,000 residents as well as monitors and manages the larger drinking water supply watershed. Hannah Doherty, Environmental Specialist at the Albany Department of Water and Water Supply , spends her days working with a small team to monitor the drinking supply and the connected water bodies. Doherty explains, “We’re the first to encounter the water that ends up being the drinking water.

Read More