$75 - $100

A-0175 Buffer Pouches, 5 each, pH 4, 7, 10, Rinse by AquaPhoenix

Assorted pH Singles Buffer Solution pack contains 5 each of pH 4.0, 7.0, and 10.0 pH buffer and rinse solutions.

LabSen 335 POM-body pH/Temp. Electrode for Wastewater Treatment by Apera

Crafted with proprietary sensor technologies and premium materials from Switzerland, LabSen 335 pH/temp. Electrode is designed for high-precision pH measurement of wastewater, suspensions, emulsions, slurries, and other dirty liquids. It also works well for general water solutions.

• The combination of open junction and polymer electrolyte eliminates the common issue of junction clogging in dirty liquid testing, ensuring consistent and precise results
• Long-life reference system for stable reference potential and long service life
• The specially formulated blue gel inner electrolyte eliminates the chance of any air bubbles inside the sensor. Just so you don't have to worry about jumping readings out of nowhere
• The built-in temperature sensor enables automatic temperature compensation

44207 Celestron Labs S20 Stereo Microscope

The Celestron Labs S20 is the perfect introductory stereo microscope offered at an economical price. With its 20x power, it's well suited for viewing details on 3D objects such as leaves, insects and many other objects. The upper LED illuminator provides detailed viewing and with the removable stage plate there is an option for bottom lighting (user supplied). You'll enjoy exciting discoveries right out of the box with the two included insect specimens. The S20 Stereo Microscope is light and easy to carry in the field making it well suited for hobbyists and students.

• Great introductory stereo microscope with 20x power
• 10x eyepieces with 2x objective lenses
• Metal head with coarse focusing knob
• Upper LED illumination for detailed viewing
• Two insect specimens included
• Two AA batteries included

44412 100 Piece Prepared Microscope Slide Kit by Celestron

A wide assortment of specimen slides covering insect parts, plant parts, animal parts, etc.

• Prepared Slides For Hours and Hours of Enjoyment and Discovery
• 1" x 3" (25 mm x 76 mm) Glass Slides
• Packed in a Wooden Case
• Listing of each of the Slides

93230 1.25" 8-24mm Zoom Eyepiece by Celestron

The amazingly versatile Celestron 8 mm-24 mm Zoom Eyepiece allows you to choose from a variety of magnifications in a flash! Simply grip the rubberized barrel and turn it slowly while looking through the eyepiece, and then pick the best power for the object you are observing. Alternatively, you can use the lowest magnification (24 mm) to find an object and center it in your field of view, and then increase the power until the desired view is achieved. It is fast and easy, and lets you examine any object at various magnifications without requiring you to physically change eyepieces.

The Celestron 8-24mm Zoom Eyepiece uses premium optics that are fully multi-coated for crisp, clear images. The folding eyecup lets you view with or without glasses, and the field of view (40 - 60 degrees) works well for terrestrial observations as well as for views of the Moon, planets, and deep-sky objects.

• Zoom from low to high power in an instant with this versatile eyepiece!
• Compatible with any telescope that accepts 1.25" eyepieces.
• This fully multi-coated premium eyepiece zooms to any focal length between 8 mm & 24 mm - pick the best magnification for your subject.

93420 X-Cel LX 2.3mm Eyepiece by Celestron

Celestron X-Cel LX series eyepieces offer a 60° apparent field of view, perfect for the Moon, the planets, and a plethora of deep-sky objects. The premium six-element optical set is finished with multiple layers of high-transmission coatings for clear, sharp images. The edges of the optics are blackened for increased contrast. All seven X-Cel LX eyepieces sport 16 mm of comfortable eye relief, and are parfocal, which means you can switch out eyepieces within the series during observing sessions and little or no additional focusing will be required.

The X-Cel LX eyepiece body is made of black-anodized aluminum. The pop-up eyecups make it easy to adjust the height for different users. Turn them in one direction to extend the length, and the other direction to provide a flat surface, preferable to most eyeglass wearers. A treaded rubber grip around the center of the eyepiece barrel offers secure handling, even in moist conditions or with heavy gloves on. The 1.25" insert barrel is threaded to accept filters.

• X-Cel LX eyepieces, optimized for planetary viewing, offer a 60° field of view through a six-element fully multi-coated lens system.
• Pop-up rubber eyeguards provide comfort and increase contrast. Raise and lower with a simple twist.
• A treaded rubber grip offers a no-slip grip, even with gloves on.
• 1.25" barrels are threaded to accept filters.
• The Celestron X-Cel LX Series includes the following focal lengths in a 1.25" format: 5 mm, 7 mm, 9 mm, 12 mm, 18 mm, 25 mm