$15 - $20

44428 EclipSmart Universal Solar Filter by Celestron

Turn your telescope, spotting scope, or DSLR camera into a solar scope! The EclipSmart Universal Solar Filter is a must-have accessory perfect for viewing the Sun and eclipses like the upcoming 2023 Annular Solar Eclipse and 2024 Total Solar Eclipse. Affordable, easy to use, and best of all, Solar Safe, this filter conforms to the ISO 12312-2:2015(E) international safety standard. The EclipSmart Universal Solar Filter has a solar filter aperture of 60mm and works with any optic or lens measuring 75 to 100 mm in diameter, including telescopes, spotting scopes, and DSLR camera lenses. The solar filter fits around your optical device with adjustable side panels that secure with a rubber band for a snug fit. We include (2) rubber bands, but we recommend that you change out the bands frequently. To replace use #32 rubber bands. When it's not in use, fold the filter flat and place it inside the reusable bag.

If you plan to use this filter with your DSLR camera, we recommend adding a sunshade to the camera lens. This will expand the lens diameter and allow for a more secure attachment to the filter using the rubber bands. We also recommend using a tripod, monopod, or other stabilizing device with your camera setup. You can use your camera and filter intermittently over extended periods of up to several hours, but do not point your camera and filter directly at the Sun for more than three continuous minutes.

Never use this filter if your camera has an optical viewfinder. If you are uncertain about the type of viewfinder on your camera, do not use this filter. Always ensure that the filter is placed directly onto the camera lens during imaging, never between the viewfinder and your eye.

If you would like to use tape to secure the filter to your optic, Celestron recommends low-tack painter's tape to prevent any potential damage to your optic.

Solar Safe Technology

EclipSmart solar products feature Solar Safe filter technology—the ultimate protection from harmful solar radiation, including IR and UV light, plus 99.999% of visible light. Celestron Solar Safe filter technology is SAFE for direct observation of the Sun and has been independently tested to conform to and meet the transmission requirements of ISO 12312-2:2015(E), Filters for Direct Observation of the Sun, EN 1836:2005 + A1:2007 (E) for an E15 Filter for the Direct Observation of the Sun and AS/NZS 1338.1:2012, Filters for Eye Protectors.

Important safety note: inspect your filter before every use. Do not use and discard if damaged, torn, punctured, or separated from the frame in any way.

• SOLAR SAFE TELESCOPE FILTER: Filter conforms to the ISO 12312-2:2015(E) international safety standard for filters directly viewing the Sun. The ideal tool for viewing eclipses, sunspots, or the Sun any day!
• WORKS WITH YOUR EXISTING TELESCOPE, SPOTTING SCOPE, OR DSLR CAMERA: Compatible with objective lenses with an outside diameter of 75mm to 100mm.
• SAFE, SNUG FIT: To use, adjust the side panels to fit the filter on your optical device and attach the rubber band for a secure fit.
• COMPACT AND PORTABLE: Filter folds flat for storage in its reusable bag when not in use.
• SOLAR FILM MADE IN THE USA: Our Solar Safe film is produced in the USA by American Paper Optics, one of the suppliers recommended by NASA for safe solar viewing.
• GREAT VIEWS AND IMAGES: This filter features an orange tint, producing a natural look perfect for visual observing and capturing images through your scope or camera.

AI1101-L pH 7.00 Calibration Buffer Solution 16 oz. by Apera

The Apera Instruments AI1101 pH 7.00 Calibration Buffer Solution is color-coded and standardized against NIST certified pH references within 0.01 pH at 25°C (77°F). It's ideal for the calibration of all kinds of pH meters/testers. Since pH level is affected by temperature, a temperature/pH reference chart is provided on the bottle label for reference.

All the solutions are double-sealed, not subject to the DOT shipping restrictions, and have a 2-year shelf life. The expiration date is printed on the bottle.

MSDS documents are downloadable. Certificate of analysis can be achieved by request.

Note: Store at room temperature and away from direct sunlight. Keep the bottle tightly closed when not in use. Keep out of reach of children.

• High Accuracy (±0.01 pH): standardized against NIST certified pH references within 0.01 pH at 25°C (77°F).
• Ideal for the calibration of all kinds of pH meters/testers
• Color-coded, Double-sealed, 2-Year shelf life
• Expiration date and Temperature/pH reference chart provided for reference
• Non-hazardous product (MSDS is downloadable)

411-0018-038 Last-O-More Tubing 3x5 mm per Meter by WatchGas

Regarding sampling tubes for gas detectors, many manufacturers promote clear tubing as a cost-effective solution for drawing air from confined spaces. While affordability may be a key selling point, it's essential to recognize the limitations of clear tubing in gas detection.

In the automotive industry, clear tubing is avoided for crucial systems like fuel and windshield fluids because it lacks the necessary inertness. The same principle applies to gas detection. Some argue that clear tubing offers two benefits: it allows visibility of fluid intake, and discoloration signals the need for replacement. However, once a fluid is drawn into the tube, contamination of the inner walls occurs, requiring immediate replacement. Best practices call for avoiding fluid intake altogether, which is why devices like ball floats are used—visible, such as the yellow one pictured.

Discoloration of clear tubing often points to a reaction between the sampled gases and the tubing material itself, proving the material's unsuitability rather than providing a reliable replacement indicator.

Inexpensive aquarium tubing made from PVC is commonly repurposed for gas detection, but PVC's inherent odour is a clear sign it's not suitable. While there are other, more promising materials—such as those with Teflon inner linings—these are no longer cheap, and Teflon can flake, causing blockages.

That's why we developed Last-O-More tubing, made from fluorinated elastomer (rubber). It's inert, doesn't flake, is highly flexible, and resists binding. Plus, it's explicitly marked as a gas sampling tube to ensure correct use.

While not the cheapest option, Last-O-More tubing has been rigorously tested in the lab using GC analysis. It has proven to be the best in absorption and retention—retention, meaning the release of absorbed gases when exposed to heat (like sunlight).

Last-O-More tubing is black, so always pair it with a ball float or water trap (filter) and replace it when it no longer feels slippery. Proper tubing is critical in gas detection—don't compromise safety.