Phase Shift Test Slide HSE/NPL (5 band / 6 partial)


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*** Effective immediately, the 4 Band Phase Shift Test Slide have been approved by NIOSH & HSL. There is no time-table when and if the 5 bands will be available.

*** Phase Shift Test Slide 5 bands are currently on global back order due to delays in production. We are taking orders and shipping accordingly. We appreciate your patience.

Now approved by NIOSH for use in the USA.

The slide provides a means of checking the detection limit of phase-contrast microscopes and is intended primarily for use with the membrane filter method of measuring airborne asbestos fibers.

The test objects on the Mark II version, which is commercially available, are sets of ridges of resin, mounted on a conventional microscope slide, and immersed in a second resin of slightly lower refractive index. The finest ridges are too faint to be seen by most good-quality microscopes. The great majority of users who responded to inquiries found the slide a useful accessory.

Daily use of the Phase Shift Test Slide (5 Band) is required in Britain during measurement by the European Reference version of the membrane filter method.

We're happy to answer all your questions about this product.

  1. A There is no expiration date on the certificate. However, please note, the slide must be clean an free of scratches and free of debris.
  2. Q do you get the HSL Certificate when you buy it? answer now
    Asked by Milena on October 23, 2019 4:58 pm
    A Yes, the certificate is included.

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  • Shipping methods available: UPS / FedEx / USPS
  • Weight: 1 lbs
  • Dimensions: 6 × 6 × 6 in


If you are dissatisfied with your purchase, let us help you with a replacement, return or repair. Items can be returned within 7 business days of receipt of your order without any restocking fee. Items must be in new condition with the original packaging.

Please contact us to receive an RMA number and steps on how to proceed with your return.

Exclusions may apply. For more information, read our Returns and Exchanges policy

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