Test slides for Optical Microscopy and Scanning Electron microscopy (SEM)

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Welcome to Test Slides, the second (*) online store of Diatom Lab! Our preparations allows you to observe Diatoms and other microscopic objects in Very High Definition! Diatom Lab is the state-of-the-art scientific laboratory company founded in 2016 (VAT number IT 01635810193) that specializes in ground-breaking Micromanipulation services, Test slides for microscopy, Scientific photography / Microscopy imaging services.
(*) For more microscope slides of Diatoms, Radiolarians and other microscopic objects, please visit the main site https://www.diatomshop.com/
Diatom Lab produces prepared microscope slides of the highest quality: our laboratory stands out for the use of unique cutting-edge materials, technologies and procedures. For further information please visit the pages "Innovative preparations" and "Diatom Lab. Clients and reputation".
"Few objects are more beautiful than the minute siliceous cases of the Diatomaceæ: were these created that they might be examined and admired under the higher powers of the microscope?” (Charles Darwin, On the Origin of Species). Interesting facts about Diatoms: they are unicellular organisms, specifically microalgae, and live in waterways, oceans, and soils; they produce approximately 20 to 50 percent of the oxygen on Earth; they are primary producers in the food chain and constitute nearly half of the organic material found in the oceans; since the discovery of the microscope, architects and artists have been inspired by Diatom forms.
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We safely ship Worldwide: all parcels are fully tracked, so that you can check the progress of your items through to delivery! We have customers in many countries including the UK, USA, Europe, Asia, Africa and Oceania, and look forward to working with you! Combined shipping: worldwide shipping by registered international parcel is always 11,90 euros, no matter how many items are in the cart! Payments are accepted with PayPal (no PayPal account needed, just a credit card!) or bank transfer. Diatom Lab works with honesty, accuracy and transparency: you'll always receive a proper invoice with every purchase.
DIATOM TEST SLIDES FOR OPTICAL MICROSCOPES (MICROSCOPE SLIDES OF SELECTED, MICROMANIPULATED TEST DIATOMS). TEST YOUR MICROSCOPE! Venture into the Micro and Nano structures! Diatom Test Slides are extremely useful to: A) compare objectives, condensers, microscopes, and optical microscope illumination techniques such as bright field, oblique illumination, differential interference contrast (DIC), phase contrast, dark field, polarized light, Rheinberg illumination, and Hoffman modulation contrast! B) practice using your microscopes at their highest levels! C) determine the resolving power of your microscope (the resolving power of a microscope is measured by its ability to differentiate two lines or points in an object)! D) examine the variations in contrast and resolution by regulating the condenser aperture diaphragm E) understand the importance of correction collar for minimazing spherical aberration F) examine the variations in resolution by using different wavelengths of light.
All micromanipulated Diatoms are guaranteed to be fixed directly to the UNDERSIDE of the custom, optical quality cover glass (and not, as is common, on the microscope slide) for maximum resolution and contrast! The reason for this: microscope objective performance drops quickly and noticeably as the specimen distance from the cover glass increases. Microscope objective lenses are designed to be optimally corrected for objects located immediately below the coverslip!

- Walker D., 2022. Note on 'diatom dotting' at low magnifications. Resolving Stauroneis phoenicenteron. Part 2. Resolving pores with a 10X objective. Micscape Magazine, 318 (ISSN 1365 – 070x) link "Acknowledgement: The author used the invaluable 'Test Slide version 2.0' (Diatom Cubed mountant) supplied by Stefano Barone of Diatom Lab”
- Walker D., 2021. Note on 'diatom dotting' at low magnifications. Resolving Stauroneis phoenicenteron, Micscape Magazine, 306 (ISSN 1365 – 070x) “Acknowledgement: The author used the invaluable 'Test Slide version 2.0' (Diatom Cubed mountant) supplied by Stefano Barone of Diatom Lab"
- Bulletin of the Quekett Microscopical Club, Nov 2019, No.77, ISSN 1350-9128, pp 22-25: the article recognizes Diatom Lab preparations as expertly-prepared and three microscope images of our slides have been published, such as a detail of the Diatom Test Slide version 2.0 with the comment “image chosen by editor to show the incredible resolution of this excellent slide”
- Barone S., 2022. Diatom Lab Microscope Test Slide in commemoration of Edmund J. Spitta, Micscape Magazine, 321 (ISSN 1365 - 070x)
Diatom Test Slide version 2.0: microscope slide of 5 Test Diatoms
TEST YOUR MICROSCOPE! WATCH THE VIDEO on Diatom Test Slide Version 2.0 PAGE! Venture into the Micro and Nano structures!
This microscope slide contains the following Micromanipulated Diatoms:
1) Stauroneis phoenicenteron (for Dry objectives),
2) Gyrosigma attenuatum (for Dry and Oil immersion objectives),
3) Gyrosigma reimeri (for Oil immersion objectives),
4) Navicula oblonga (for Double immersion = Oil immersion objective and Oil immersion condenser),
5) Pinnularia nobilis (for Double immersion = Oil immersion objective and Oil immersion condenser).
In Diatom Cubed mountant (refractive index > 1,7).
All Micromanipulated Diatoms are guaranteed to be fixed directly to the UNDERSIDE of the custom optical quality cover glass (and not, as is common, on the microscope slide) for maximum resolution and contrast! The reason for this: microscope objective performance drops quickly noticeably as the specimen distance from the cover glass increases. Microscope objective lenses are designed to be optimally corrected for objects located immediately below the coverslip!
To read the INSTRUCTION MANUAL WITH QUANTITATIVE FEATURES (number of striae and areolae in 10 µm and/or the average distance between areolae), simply visit the "Diatom test Slide Version 2.0" Page
They wrote about us: Bulletin of the Quekett Microscopical Club, Nov 2019, No.77, ISSN 1350-9128, pp 22-25: the article recognizes Diatom Lab preparations as expertly-prepared and three microscope images of our slides have been published, such as a detail of the Diatom Test Slide version 2.0 with the comment “image chosen by editor to show the incredible resolution of this excellent slide”
129.00 €
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Diatom Lab Microscope Test Slide in commemoration of Edmund J. Spitta. A Complete Test for all dry and oil immersion lenses from 10x to 100x, in Bright Field, Oblique illumination, Phase contrast, Darkfield, Oil immersion darkfield and DIC. Download the instructions and the interesting book excerpts from www.diatomshop.com website
129.00 €
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Diatom Test Slide of Micromanipulated Neidium iridis
DIATOM TEST SLIDE of Micromanipulated Neidium iridis var. amphigomphus (Ehr.) A. Mayer
Details to resolve: areolae, forming the striae
Striae in 10 µm: 15-16 longitudinal
Suggested techniques: Dry or Oil immersion microscope objectives in Bright field, or Bright field with Oblique illumination, or Dark field illumination, or Phase contrast, or Differential interference contrast (DIC)
In Diatom Cubed mountant (refractive index > 1,7)
59.00 €
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Diatom Test Slide of Micromanipulated Craticula cuspidata
DIATOM TEST SLIDE of Micromanipulated Craticula cuspidata (Kützing) DG Mann ex Rotonda et al. (1990)
Details to resolve: very small areolae, forming the striae
Striae in 10 µm: 16-17 longitudinal
Suggested techniques: Oil immersion microscope objectives in Bright field, or Bright field with Oblique illumination, or Dark field illumination, or Phase contrast, or Differential interference contrast (DIC)
In Diatom Cubed mountant (refractive index > 1,7)
69.00 €
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Diatom Test Slide of Micromanipulated Lyrella spectabilis
DIATOM TEST SLIDE of Micromanipulated Lyrella spectabilis (Gregory) D.G.Mann
Details to resolve: areolae, forming the striae
Striae in 10 µm: 10-11 longitudinal
Suggested techniques: Dry or Oil immersion microscope objectives in Bright field, or Bright field with Oblique illumination, or Dark field illumination, or Phase contrast, or Differential interference contrast (DIC)
In Diatom Cubed mountant (refractive index > 1,7)
59.00 €
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Diatom Test Slide of Micromanipulated Nitzschia heufleriana
DIATOM TEST SLIDE of Micromanipulated Nitzschia heufleriana Grunow 1862
Details to resolve: striae or eventually stria pores in double immersion
Striae in 10 µm: 24-25
Suggested techniques:
1) Striae: Oil immersion microscope objectives in Bright field, or Bright field with Oblique illumination, or Dark field illumination, or Phase contrast, or Differential interference contrast (DIC);
2) Stria pores: Double immersion (= Oil immersion objective and Oil immersion condenser)
In Diatom Cubed mountant (refractive index > 1,7)
69.00 €
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Diatom Test Slide of Micromanipulated Nitzschia linearis
DIATOM TEST SLIDE of Micromanipulated Nitzschia linearis W.Smith
Details to resolve: striae or eventually stria pores in double immersion
Striae in 10 µm: 29-30, parallel
Suggested techniques:
1) Striae: Oil immersion microscope objectives in Bright field, or Bright field with Oblique illumination, or Dark field illumination, or Phase contrast, or Differential interference contrast (DIC);
2) Stria pores: Double immersion (= Oil immersion objective and Oil immersion condenser)
In Diatom Cubed mountant (refractive index > 1,7)
69.00 €
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Diatom Test Slide of Micromanipulated Pinnularia dactylus var. dariana
DIATOM TEST SLIDE of Micromanipulated Pinnularia dactylus var. dariana (A.Schmidt) Cleve
Details to detect: poroids
The theoretical limit of resolution of most light microscopes is ∼ 0.2 μm, but these poroids can be detected by the techniques below, thanks to Diatom Cubed high refractive index mountant!
Viewed with SEM, QUANTITATIVE FEATURES in Diatom Lab's sample are:
Poroids inside the striae: 44 - 45 in 10 µm
Average distance between poroids: 0,072 - 0,089 µm. See SEM image from the same sample!
(While In Amphipleura pellucida striae number 37-45 in 10 µm and pores are spaced 0,16 - 0,19 µm apart)
Recommended microscope objectives: Oil-immersion 63 or 100x objectives having a very good or excellent numerical aperture (1,3 or 1,4);
Suggested techniques to detect the poroids: Double immersion (= Oil immersion objective and Oil immersion condenser) with Polarized light (the polarizers should be oriented perpendicular to each other = maximum level of extinction) and possibly oblique illumination; or Immersion dark field condenser (better 1,2/1,4) with Polarized light (the polarizers should be oriented perpendicular to each other = maximum level of extinction)
In Diatom Cubed mountant (refractive index > 1,7)
79.00 €
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Diatom Test Slide of Micromanipulated Surirella striatula
DIATOM TEST SLIDE of Micromanipulated Surirella striatula Turpin (frustule has a strong torsion along the apical axis)
Details to detect: areolae, forming the striae
Viewed with SEM, the average distance between areolae is 0,14 µm.
The theoretical limit of resolution of most light microscopes is ∼ 0.2 μm, but these areolae can be detected by the techniques below, thanks to Diatom Cubed high refractive index mountant!
Recommended microscope objectives: oil-immersion 63 or 100x objectives having a very good or excellent numerical aperture (1,3 or 1,4)
Suggested techniques: Double immersion (= Oil immersion objective and Oil immersion condenser) in: Polarized light (the polarizers should be oriented perpendicular to each other = maximum level of extinction) with possibly oblique illumination; or Immersion dark field condenser (better 1,2/1,4) with Polarized light (the polarizers should be oriented perpendicular to each other = maximum level of extinction)
In Diatom Cubed mountant (refractive index > 1,7)
69.00 €
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TEST INTEGRATED CIRCUITS for light microscopes in reflected light, stereo microscopes, scanning electron microscopes (SEMs), objectives for macro photography   
Test Integrated Circuit for Reflected light and SEM
Very small integrated circuit (0.75mm X 0.66mm) with many fine details, dry mounted on microscope slide without cover glass. Excellent for testing light microscopes in reflected light, stereo microscopes, scanning electron microscopes (SEMs), objectives for macro photography! This test integrated circuit has been discussed in the following article: Walker D., Exploring the Diatom Lab prepared slide of an integrated circuit chip, Micscape Magazine, April 2020, Issue 289, ISSN 1365 – 070x: "The slide is impeccably prepared / mounted", "In my view the slide is excellent value for money and maintains the high standards set by the Diatom Lab shop (I have a number of the diatom slides)"
49.00 €
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OPTICAL ABERRATIONS DETECTOR. It's a very useful Diatom Lab microscope slide that detects optical aberrations - even the most imperceptible ones - in light microscopy, such as: a) Curvature of field (the image appears sharp and crisp in the center or on the edges of the viewfield but not both); b) Distortion (changes in the shape of the image); c) Barrel distortion and Pincushion distortion; d) Spherical aberration (the specimen image appears hazy or blurred and slightly out of focus); e) Chromatic aberration (presence of color fringes at the edges of the borders); f) Astigmatism (the ideal circular point image blurs into a diffuse circle, elliptical patch, or line). Thanks to this unique microscope slide, you can easily test and compare your objectives, eyepieces, condensers, phototubes, microscope cameras, and magnification changers! This is an amazing microscope slide in the center of which there are, incredibly, 90.000 microscopic squares having a side of 10 µm (ten micrometres or microns) and 10 µm apart! These microscopic squares also form nine larger squares useful in case of low magnification (see the page "Optical Aberrations Detector, Centering Device, Micrometers" for better image quality). This slide is excellent for testing macro lenses as well! Click on this link to download the pdf file. All Rights Reserved.
Optical Aberrations Detector for transmitted light
Optical Aberrations Detector for transmitted light (with cover glass and mountant). Due to the high demand new stock is in production, it takes about 30 days to ship
Limited availability
199.00 €
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Optical Aberrations Detector for reflected light
Optical Aberrations Detector for reflected light (without cover glass). Due to the high demand, a new stock is in production, it takes about 30 days to ship
Limited availability
199.00 €
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CENTERING DEVICE & MICROMETER GLASS SLIDE. It's an all-in-one microscope slide that incorporates a centering device to center the microscope and the camera and a stage micrometer for microscope calibration. The centering device consists of 25 perfect concentric circles, 50  µm (fifty micrometres or microns) thick and 50 µm apart! It is very useful to center the microscope parts (condenser top lens, field iris diaphragm, prisms of the binocular/trinocular head, etc.) and the microscope camera. (It is advisable to make changes to the microscope only if you are an expert.) The stage micrometer for microscope calibration is a 1 mm Scale with 0,01 mm (10  µm) divisions; the slide can be used in combination with a micrometer eyepiece or a measurement software (for cameras) in order to measure preparations. (See the page "Optical Aberrations Detector, Centering Device, Micrometers" for better image quality.) All Rights Reserved.
Centering Device & Micrometer Glass Slide for transmitted light
For transmitted light (with cover glass and mountant). Diatom Lab CENTERING DEVICE & MICROMETER GLASS SLIDE is an all-in-one microscope slide that incorporates a centering device to center the microscope and the camera and a stage micrometer for microscope calibration. The centering device consists of 25 perfect concentric circles, 50 µm (fifty micrometres or microns) thick and 50 µm apart! It is very useful to center the microscope parts (condenser top lens, field iris diaphragm, prisms of the binocular/trinocular head, etc.) and the microscope camera. The stage micrometer for microscope calibration is a 1 mm Scale with 0,01 mm (10 µm) divisions. The slide can be used in combination with a micrometer eyepiece or a measurement software (for cameras) in order to measure preparations.
149.00 €
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Centering Device & Micrometer Glass Slide for reflected light
For reflected light (without cover glass). Diatom Lab CENTERING DEVICE & MICROMETER GLASS SLIDE is an all-in-one microscope slide that incorporates a centering device to center the microscope and the camera and a stage micrometer for microscope calibration. The centering device consists of 25 perfect concentric circles, 50 µm (fifty micrometres or microns) thick and 50 µm apart! It is very useful to center the microscope parts (condenser top lens, field iris diaphragm, prisms of the binocular/trinocular head, etc.) and the microscope camera. The stage micrometer for microscope calibration is a 1 mm Scale with 0,01 mm (10 µm) divisions. The slide can be used in combination with a micrometer eyepiece or a measurement software (for cameras) in order to measure preparations.
149.00 €
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CUSTOMIZED ARRANGEMENTS, SERVICES
Diatom frustules for Photonic Researches and Applications
Specifically mounted diatom frustules for photonic researches and applications. In fact Diatoms are photonic crystals (photonics is the skill of manipulating photons): they exhibit sophisticated optical systems. Diatom Lab has collaborated with various institutes by providing specifically mounted diatom frustules for many researches. Price: ask for a free quote
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0.00 €
High resolution Microscope Images and Microscope Videos
High-resolution microscope images and microscope videos (exclusive or non-exclusive licences): Diatom Lab has won several international scientific photography awards. We provide scientific imaging services using our state of the art Zeiss Axio Imager.A2 and other microscopes in full frame camera format. Various illumination techniques are available. Price: ask for a free quote
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0.00 €
New Publications, Articles for magazines
New publications, articles for magazines: ask for a free quote
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Please feel free to contact us with questions regarding quotes for customized products and services. We will do our best to answer your request as soon as possible. For more microscope slides of Diatoms, Radiolarians and other microscopic objects, please visit the main site https://www.diatomshop.com/
"The revelations of the Microscope are perhaps not excelled in importance by those of telescope. While exciting our curiosity, our wonder and admiration, they have proved of infinite service in advancing our knowledge of things around us"(Joseph Leidy)
  Diatom Lab, VAT number IT 01635810193  contact: info@diatomshop.com   All Rights Reserved

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