pH 5-9 Test Strip

The pH 5-9 test strip is a narrow range strip and is ideal for weak solutions, such as alkaline or rain water, measuring in steps of 1.0 pH units.

pH 5-9 Test Strip

  1. Remove one pH 5-9 test strip from the bag, holding one end of the strip between your index finger and thumb. Do not touch the test pad with your fingers.
  2. Dip the test strip about 1/2″ into the solution to be tested for 1-2 seconds.
  3. Remove and shake off any excess liquid.
  4. Compare immediately to the color chart. Do not allow the test strip to dry before reading against the color chart.

pH 5-9 test strip, pH 5-9, pH test strip

Disclaimer: Precision Laboratories products are not approved for use as medical devices. Products and product information is for informational purposes only and not intended for use to diagnose, treat, cure or prevent any medical condition. Consult a medical doctor when needed.

CZ5090; CZ5090/S; PH5090; PH5090-1B-50; PH5090-12B-50

Product Specs

SKU:

PH5090-1B-50 (1 bag)

Strip Quantity:

50 strips

Bag Dimensions:

3" (W) x 4" (H) [76mm (W) x 102mm (H)] (Clear)

Strip Dimensions:

2.5" (L) x .1875" (W) [64mm (L) x 5mm (W)]

Weight:

0.02 lbs [9.5 g] (50-strip bag)

Shelf-Life:

3 Years Minimum

Label:

Customizable water-resistant label

Product Documentation

Does temperature affect the pH test strips?

Our pH Color charts were developed using NIST-traceable pH buffers at 25°C. Colorimetric pH test strips do not offer “temperature compensation.” Care should be used when comparing results using test strips to those obtained with a temperature compensated pH meter. It is well established that the “true pH” of a solution will be influenced by temperature. The extent of the effect is specific to the solution being tested. It is good practice to record the temperature of the solution when expressing results of pH testing. In the case of test strips, since they do not compensate for temperature, it is recommended that the sample being tested be brought to room temperature first.

I'm testing the pH of RO, distilled, and tap water, but the test strips aren't changing color. Are the strips not working or is my water off the charts?

When testing RO, distilled, or tap water, the strips may not behave like you would expect. The colors on the chart were developed for these strips using buffer solutions. The indicators used with the strips require that the waters being tested have some buffering capacity. RO and distilled waters have little or no buffering capacity, and the test strips will not work in these waters. If the tap water has a very low buffer capacity (low hardness, low alkalinity, etc.) the color can take much longer than the recommended 1-2 second immersion and 10-15 development time.

Can I use pH test strips in non-buffered or low-buffered aqueous solutions?

Currently, our pH test strips are designed for testing buffered solutions, and the calibrations (color charts) are made on buffers against a pH-meter measurement. For non- or low-buffered solutions, these strips are not suitable. For this purpose, there are special pH test pads designed for low-ionic and low-buffered waters, such as water in aquariums or pools. Please see our Aquarium and Pool test strips.

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