$75 - $100

AI223 SX620 pH Pen Tester Kit (±0.01 pH) by Apera

• The smallest pH pen with a reliable testing performance for regular liquid e.g. pools, hydroponics, aquaculture, cooling towers, beverage making, body fluid, etc
• ±0.01 pH accuracy; Automatic 3-point calibration; 0-60°C Automatic Temp. Compensation
• A slim replaceable probe, suitable for test tubes
• Intelligent functions: switch from °F to °C, automatic power-off, pH probe invalidation reminder (remind you to replace the probe for better performance)
• Complete kit: 3 types of premixed calibration solutions (4, 7, 10) and storage solution (3M KCL) all in one portable case

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

PROBONE OnePen Replacement Probe by Bluelab

Unlock the secrets to thriving plants. Maximize the life & accuracy of your Bluelab OnePen™

Features

• Extends the life of your Bluelab OnePen™, minimizing the need for full device replacements
• Quick and simple to replace, reducing downtime and keeping your OnePen™ functioning optimally
• Built to last with a double-junction pH probe and titanium EC electrodes
• Delivers precise pH, Conductivity (EC), and Temperature readings with easy calibration
• Cost-effective, sustainable maintenance
• IP68-certified waterproof and dustproof

18763 PowerTank Lithium LT by Celestron

Power your telescope anywhere with the PowerTank Lithium LT, our smallest and lightest lithium-ion power pack. This handy device is a must-have for your telescope and accessories, camping gear, emergency kit, and more.

• Our most compact, lightweight, and portable lithium power pack
• The built-in 12 volt regulating circuit Provides your telescope with up to 8 hours of consistent power at the proper voltage for optimum telescope performance
• Comes with a rapid charge USB port for fast-charging your electronic devices in the field
• Meets current FAA carry-on baggage regulations

Stable Power Designed for Telescopes

The PowerTank Lithium LT is built with Lithium Nickel Manganese Cobalt Oxide [LiNiMnCoO2] or NMC technology, which delivers a steady charge over long periods and requires less maintenance than a traditional sealed lead-acid battery.

Unlike other lithium-ion power packs in this price range, the PowerTank Lithium LT was designed for astronomers by astronomers-specifically for the unique needs of computerized telescopes.

Telescope electronics are very sensitive to voltage. Powering a telescope with lower-than-optimal voltage can cause the motors to strain with heavier loads and can even cause the electronics to glitch. The PowerTank Lithium LT uses a built-in voltage regulator to ensure that it delivers at least 11.8 volts for most of the life of the battery, until the battery is depleted and shuts off.

You may see competitor batteries claiming that they hold enough watt-hours of electricity to power your telescope for hours. The technology in these batteries was originally developed to power much lower-voltage electronics, such as home CPAP machines. Although the voltage actually being delivered starts off at 12V, it diminishes rapidly, impacting your telescope's performance and becoming functionally useless within about 2-3 hours.

Celestron's telescope engineers worked hand-in-hand with battery suppliers on PowerTank Lithium LT to ensure that it does not experience this dropoff in performance. The built-in voltage regulator ensures a stable 12V output, regardless of the amount of charge left in the battery. This keeps your telescope's electronics safe and performing their best, so you can focus on astronomy.

The NMC chemistry used by the PowerTank Lithium LT offers far more advantages than the commonly used Lithium Cobalt Oxide batteries found on the market today. Besides having a longer shelf life and three times the number of charge cycles than LiCoO2 chemistry, our NMC battery offers overcharge and over-discharge protection and can withstand temperatures 100o F (60o C) higher than LiCoO2 batteries making the NMC less likely to experience thermal runaway.

Compared to a lead-acid battery, the PowerTank Lithium LT is smaller, lighter, more efficient, and better for the environment. It offers better performance, a longer lifespan, and safer operation than other low-cost lithium-ion battery chemistries. It also offers automatic shut-off, reverse polarity protection, charging/discharging protection, overcurrent protection, and short circuit protection.

Use in the Field

The power pack's extremely portable form factor means it can go anywhere from a remote dark sky location for astroimaging to a weekend of camping. When it's powering your telescope, use the included 2" straps to secure the unit to your tripod leg where it is out of the way. Besides the power cable to charge your telescope, no other cables are needed.

If you need to power your telescope and charge electronic devices simultaneously, the PowerTank Lithium LT features two output ports: 1 12V DC port for the telescope and 1 fast-charging 2.1A USB charging port for smartphones and tablets. This USB port can also support any accessories that require 5V USB power.

Travel with PowerTank

The PowerTank Lithium LT can travel with you on your next vacation. At 73.3 watt-hours, it meets current FAA regulations (160 Wh) for transportation in your carry-on baggage. Please check in advance with your airline to verify they do not have stricter policies. Do not place PowerTank Lithium LT in your checked baggage.

PowerTank Lithium LT Compatibility List

Will power any computerized mount

18774 PowerTank, 12V Power Supply by Celestron

Now you can take your telescope anywhere with this portable rechargeable power supply. Whether you have a computerized telescope or operate your telescope using motors, Celestron specially designed this product with the amateur astronomer in mind -- this model is packed with useful features.

Not only useful for setting up and powering your scope, this model can also be useful as an emergency roadside accessory as it includes an emergency light, and booster terminals in place to start weak car batteries.

• 7-amp hour
• Two 12V output cigarette lighter ports
• Built-in flashlight with red filter cap
• Built-in (2) USB ports for charging portable devices
• Energy efficient LED spotlight
• Booster terminal on rear side
• Built-in Circuit Breaker for safety
• Cigarette lighter adapter included
• 110 V/220 V switchable universal AC adapter included

18780 5 amp AC Adapter by Celestron

Celestron's new AC Adapter, made exclusively for our CGEM and CGE Pro mounts, is designed to conveniently provide continuous power to your mount when an AC outlet is available. The barrel connector on the DC plug threads directly onto the mount's power jack and prevents power-offs due to inadvertent cable pulls. It delivers up to 5 Amp @ 12 VDC, which gives you plenty of power to run our biggest mounts loaded with heavy equipment. In addition, the switching-type AC-to-DC power adapter provides more power with less weight than a transformer-style power adapter.

21041 PowerSeeker 60AZ Telescope by Celestron

The Celestron PowerSeeker series of telescopes is designed to give the first-time buyer the perfect combination of quality, value, features and power. Offering exceptional value, these telescopes feature portable yet powerful designs with ample optical performance to excite any newcomer to the world of amateur astronomy.

• Quick and easy no-tool setup
• Slow motion controls for smooth tracking
• Erect image optics - Ideal for terrestrial and astronomical use
• Fully coated glass optical components with high transmission coatings for enhanced image brightness and clarity
• 3x Barlow lens triples the magnifying power of each eyepiece
• BONUS Astronomy Software download with a 10,000 object database, printable sky maps and 75 enhanced images

22007 Travel Scope 60 DX Portable Telescope with Smartphone Adapter by Celestron

Get a new perspective on nature and the Universe with the ideal day-to-night telescope, Travel Scope 60 DX. This refractor telescope includes a full height tripod and lots of bonus accessories, including a smartphone adapter so you can capture images and video through the eyepiece. It all packs up into a high-quality custom backpack — ready to go wherever your adventures take you.

Whether you take it along on your next camping trip or enjoy an impromptu backyard stargazing session, setting up the telescope is a breeze. Even on your first time out, you can assemble the telescope and its accessories in just a few minutes. The adjustable tripod legs allow you to customize the telescope's height or place it on a raised surface, such as a picnic table.

By night, Travel Scope 60 DX delivers great views of the planets, the Moon, star clusters and brighter deep sky objects like the Orion Nebula and Andromeda Galaxy. During the day, Travel Scope 60 DX doubles as a spotting scope. Enjoy amazing views of birds, wildlife, boats on the water, migrating whales, and so much more.

The entire telescope kit weighs just 5.5 pounds, so you can take it anywhere, hassle-free.

Smartphone adapter and Bluetooth shutter release

Create your own images and video of celestial or terrestrial objects with the smartphone adapter. With its light, rigid frame, this accessory allows you to connect any smartphone to your Travel Scope's eyepiece. The additional magnification provided by the eyepiece allows your phone to capture great images of the Moon and planets. This smartphone adapter installs easily by clamping over the top of an eyepiece. The smartphone is held in position with the help of tightening knobs that securely lock your phone in place. (NOTE: Some large and/or bulky phone cases (including folio style cases) may need to be removed for the phone to fit in the adapter.)

To capture the best image, Celestron has also provided a Bluetooth shutter release that allows you to trigger the camera's shutter on any Android or iOS smartphone remotely, without disturbing the placement of your phone and telescope, for a perfectly steady shot.

Manual Alt-Azimuth telescope

Navigate the sky confidently with Travel Scope 60 DX's intuitive pan handle. The Alt-Az control with clutch allows for smooth tracking and accurate pointing. Like a photographic tripod, you can move the clutch up, down, left, or right to follow your target in the eyepiece.

Deluxe Accessories Included

In addition to the smartphone adapter and Bluetooth shutter release, Travel Scope 60 DX includes a full selection of optical accessories, including two eyepieces (20mm and 8mm), an erect image diagonal, a finderscope, and a 3x Barlow lens. The two eyepieces offer different magnifications so you can view your subject at low or high power. The erect image diagonal allows for more comfortable viewing and right-side-up images. The permanently mounted finderscope will help you locate objects and quickly center them in your telescope's eyepiece.

Travel Backpack

Pack up your optical tube, tripod, eyepieces, and accessories safely and securely in the included custom backpack.

Starry Night Software

Download Celestron's Starry Night Software and learn about the night sky, celestial objects, and how to plan your next observing session. Celestron Starry Night Software is the premier astronomy software package on the market, providing detailed information, plus tips and tricks for viewing our Solar System and beyond.

• A portable telescope kit with everything you need to get started: 60mm refractor telescope with fully coated glass optics, full height tripod, travel backpack, plus lots more
• Smartphone Photography Accessories - Capture images and video through your Travel Scope with the included smartphone adapter and Bluetooth shutter release
• More Bonus Accessories – You'll also receive two eyepieces (20mm and 8mm), an erect image star diagonal, a 3x Barlow lens, and a finderscope
• Day-to-Night Performance – Use your Travel Scope for astronomical viewing at night or for observation of birds, nature, and wildlife during the day
• The custom backpack fits your telescope and all its accessories comfortably
• Observe in no time with a quick and easy, no-tool setup
• Pan handle Alt-Az control with clutch for smooth and accurate pointing

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

44302-C Deluxe Handheld Digital Microscope by Celestron

The intermediate-level Celestron Deluxe Handheld Digital Microscope is an easy to use, low power microscope. With powers of 10x to 150x, it's ideal for viewing stamps, coins, bugs, plants, rocks, skin, gems, circuit boards, and more. With the higher power magnifications, you can even view traditional microscope slides.

Best of all, you can capture your discoveries using the built-in 2.0 MP camera. Press the camera button to save images and VGA-quality video directly to your PC. Image captures up to 1920 X 1080 pixels to view your subject with clarity even on large monitors.

The LED illuminator ensures your specimens are clear and bright. An included metal stand allows for steady shots and comes in handy when viewing at higher powers, minimizing shaking and keeping your specimen in sharp focus.

For teens and adults alike, the Deluxe Handheld Digital Microscope is a fun, educational tool. It's well suited for hobbyists, quality control inspectors, medical professionals, and scientific researchers.

• USB-powered handheld digital microscope.
• Built-in 2MP digital camera for capturing images and videos.
• Wide range of magnification for a wide range of uses: 10x - 150x magnification.
• Image captures up to 1920 X 1080 pixels.
• Eight adjustable white LED illumination points.
• MicroCapture Pro Software Included.

MicroCapture Pro Software

Use the included software to capture images and video of your discoveries. Measure your specimens with built-in measurement tool.

Compatible Operating Systems included Windows 7/8/10; MAC OS 10.12 and up