pH Paper and other Test Strips
Single-use test materials used to rapidly and semi-qualitatively determine the acidity or alkalinity of liquids or to measure another parameter or substance; may include tests for starch, chlorine, and molybdenum; usually via the use of color-based reactions.
pH Papers, pH strips, pH sticks, and pH test kits are used in laboratory, industrial, and educational environments to qualitatively assess pH levels or monitor acid-base titrations in a range of sample types.pH Buffer reference standards are used for the accurate calibration of pH meters and monitors for far more precise and quantitative pH measurement.
pH Test papers are supplied either as rolls, tear-off strips, or sticks. They are impregnated with indicator dyes that change color at a specific pH. In some products, indicator dyes are covalently linked to cellulose fibers to avoid bleed-out (leaching) and contamination of the test sample.
Some pH papers indicate simple acid or base conditions with a single red-to-blue color change (also called litmus papers). Universal pH papers and strips contain a combination of indicators that cover a range of pH values up to and including 0 to 14 in a single test. The observed color change is checked against a comparison chart supplied with the papers.
Alternatively, for metered assessments of pH, standard or reference pH buffers are used to calibrate pH meters and other electrochemical sensors.
Standard Buffer Characteristics:
• Typically supplied at fixed values of pH 4.01, pH 7.00, and pH 10.01
• May be color-coded for easy and quick identification
• Certified to their nominal pH and accuracy at a specified temperature (typically 20°C)
• Supplied as ready-to-use solutions or concentrates
• Contain antifungals for extended shelf life
Alkali Scientific pH Indicator Strips 100/Box, 7 14
Test strips supplied in a classic flat storage box with an integrated color scale for quick and reliable visual comparison of results. Designed for convenient laboratory use, the compact box keeps strips protected and organized while allowing easy dispensing during routine testing procedures. Each strip provides consistent response for dependable measurements in laboratory, educational, and research environments. The clear printed color chart on the box helps users quickly interpret results without additional reference materials. These strips are suitable for general analytical applications where fast qualitative or semi quantitative testing is required. For best performance and stability, store the strips at a controlled temperature between 4–30 °C and keep the container closed when not in use to protect from moisture and environmental exposure.
Alkali Scientific Litmus Milk Agar 10mL Tube, 10/Pk
Litmus Milk Medium is a classic differential medium used to characterize bacteria based on their metabolic activity toward milk components such as lactose and casein. Each tube contains 10 mL of skim milk supplemented with the litmus indicator, which functions as both a pH and redox indicator. The medium allows multiple biochemical reactions to be observed in a single test, supporting identification of organisms such as Clostridium, Enterococcus, and Lactobacillus. Lactose fermentation produces acid that turns the medium pink, while proteolysis releases alkaline products that shift the color toward blue or purple. Additional reactions include curd formation from casein coagulation, peptonization producing a clear fluid layer, and reduction reactions where the indicator becomes colorless under anaerobic conditions.
Hach Company Chlorine (Total) Reagent Set for CN-21P
For determination of Chlorine (Total) by thiosulfate drop-count titration. Replacement reagent set for CN-21P Test Kit. Set includes Sulfamic Acid Powder Pillows, Potassium Iodide Powder Pillows and Sodium Thiosulfate Standard Solution (0.0246 N). Approx. 100 tests.
Med Vet International pH Paper Indicator Strips, pH Range 5-9, J0893M, 100 Strips/Vial
pH Paper Individual Strips in a vial. pH range 5-9, colors for each 0.5 pH unit. 100 strips/vial.
Electron Microscopy Sciences pH Indicator Paper 1.7 - 3.8
The indicator dyes of pH-Fix sticks are substantially bound to the cellulose fibers and as a result the possibility of the color bleeding, even in strongly basic solutions, is avoided. The dyes provide a sharp differentiation between the individual pH values and a clear and easy comparison to the color scale. Measurement of pH value is possible even in unbuffered or very weakly buffered solutions, since the sticks can be left in the solution until the final color change is completed. Test samples are not contaminated by the indicator dyes.
Gradations: 0.3
Electron Microscopy Sciences pH Indicator Papers - Test Papers, 0.0 - 6.0, 100/bx
The indicator dyes of pH-Fix sticks are substantially bound to the cellulose fibers and as a result the possibility of the color bleeding, even in strongly basic solutions, is avoided. The dyes provide a sharp differentiation between the individual pH values and a clear and easy comparison to the color scale. Measurement of pH value is possible even in unbuffered or very weakly buffered solutions, since the sticks can be left in the solution until the final color change is completed. Test samples are not contaminated by the indicator dyes.
Gradations: 0.5
MSC Mitutoyo Screw Drop Indicator Back, 12.7 mm Diameter, AGD Group 2, #1/4-28UNF Thread
This indicator back is designed for use with AGD Group 2 indicators, featuring a screw mount for secure attachment. It is particularly useful for special applications where the standard indicator back needs to be replaced. With a 12.7 mm diameter and a #1/4-28UNF thread size, it provides a precise and stable connection.
- Screw mount
- 12.7 mm diameter
- Compatible with AGD Group 2 indicators
- #1/4-28UNF thread size
- Ideal for special applications requiring indicator back replacement
MSC SPI Test Indicator Contact Point, 0.0780 in Ball, Carbide, 1-3/4 in Length
The product is a Test Indicator Contact Point with a 0.0780 in ball diameter and a carbide contact point, measuring 1-3/4 in length. It is designed for use with test indicators.
- Ball style
- 0.0780 in ball diameter
- 1-3/4 in contact point length
- Carbide contact point material
- Designed for use with test indicators
MSC Mahr Test Indicator, ± 0.2 mm Measuring Range, 0.002 mm Graduation, 100-0-100 Dial
This test indicator is designed for precise measurement applications such as concentricity, alignment, parallelism, and flatness. It features a high-contrast dial face, a robust matt chrome-plated protective casing, and a shockproof measuring mechanism, ensuring reliable and accurate readings in various industrial environments.
- High-contrast dial face, sealed with O-ring
- Mineral glass viewing panel for protection against scratching, damage from hot shavings, and optimal resistance to solvents
- Matt chrome-plated protective casing with three integrated dovetail guide rails
- Shockproof measuring mechanism
- Anti-magnetic model
- Automatic adjustment to the contacting direction for infallible readings
- Ball-bearing mounted double lever
- Overload protection thanks to a friction clutch