$15 - $20

93581 Night Vision Red Headlamp by Celestron

The disruptive glare of white light can ruin your stargazing experience in an instant. Steer clear of white light while still navigating your observing site safely with this astronomer's essential, the Night Vision Red Headlamp. Designed specifically to preserve your night vision, and powered by a long-lasting LED, this headlamp provides the perfect amount red-light illumination, ensuring comfortable stargazing sessions where you can see more detail in celestial objects by preserving your dark-adapted vision.

Using the Night Vision Red Headlamp is simple and intuitive. First, install (2) AAA batteries, and then adjust the headlamp strap for a comfortable and secure fit, so it sits snugly on your head. Next, adjust the lamp's pointing position up to 45° to direct the light exactly where you need it. Depending on the task at hand, the headlamp is equipped with two red brightness levels, a blinking light, and an SOS setting. You can walk around your observing site, read star charts, or even grab that eyepiece you left in your gear bag, all while preserving your night vision.

Rigorously tested to ensure reliability and longevity, the Celestron Night Vision Red Headlamp provides up to 100 hours of continuous illumination, when set to the low brightness setting. That means you can rely on your headlamp to accompany you through countless stargazing sessions, camping trips, and outdoor adventures without worrying about running out of power. And if you do run out of juice, simply pop in fresh batteries and keep going–no need to find a power source and wait to recharge via USB.

• Optimal Night Vision: A traditional white flashlight can ruin your night vision in an instant. Preserve your eyes' dark adaptation while navigating your environment safely with this red-only LED headlamp. It minimizes disruption and allows for extended stargazing sessions without eye strain.
• Hands-Free Convenience: Enjoy the freedom of hands-free illumination with this adjustable headlamp. It's perfect for setting up telescopes, handling star charts, and more.
• Multiple Light Modes: Seamlessly switch between two brightness levels, a blinking light, and an SOS setting.
• Comfortable Fit: The adjustable, ergonomic head strap provides a secure and comfortable fit, ideal for long nights under the stars. And with a 45° adjustable angle, you can direct the light where you want it.
• Long Battery Life: Powered by an efficient LED, this headlamp offers up to 100 hours of continuous use, ensuring reliable performance for all your adventures.
• Versatile and Portable: Perfect for astronomers, campers, and outdoor enthusiasts, this headlamp is a versatile, grab-and-go tool for a variety of nighttime activities.

AI1129 pH 11.00 Calibration Buffer Solution 8oz by Apera

The Apera Instruments pH 11.00 Calibration Buffer Solution is standardized against NIST certified pH references within 0.01 pH at 25°C (77°F). It's ideal for the calibration of pH meters that have customized calibration functions (e.g. Apera PH800, PH820, SX811).

pH value is affected by temperature variations. 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.

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
• Double-sealed, 2-Year shelf life
• Expiration date and Temperature/pH reference chart provided for reference
• Non-hazardous product (MSDS is downloadable)

C-7599 Oxygen Comparator (round) by AquaPhoenix

C-7599 Dissolved Oxygen Comparator is a component of K-7599 Dissolved Oxygen CHEMets Visual Test Kit and is designed to be compared against the color formed in R-7540 Dissolved Oxygen CHEMets Refill. The comparator's range is applicable to many industrial applications. Color standards are pink in color and cover a range of 0-100 ppb Oxygen.

AI1131-S 12.88 mS/cm Conductivity Calibration Solution 4 oz. by Apera

The Apera Instruments 12.88 mS/cm Standard Conductivity Calibration Solution is made of high-purity chemicals, standardized against NIST certified references at 25°C (77°F). It's ideal for the calibration of all types of conductivity meters. Since conductivity value is affected by temperature, the temperature & conductivity reference table is provided on the bottle labels for your reference.

All the solutions are double-sealed, not subject to the DOT shipping restrictions, and have a 1-year shelf life. The expiration date is printed on the bottle.

MSDS is downloadable at support.aperainst.com; The Certificate of Analysis can be acquired by requests.

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.

• Standardized against NIST certified references at 25°C (77°F), ideal for the calibration of all types of conductivity meters
• Double-sealed, 1-Year shelf life
• The expiration date and Temperature/pH reference table is provided for reference
• Non-hazardous product (MSDS is downloadable)

C-7518 Oxygen Comparator (round) by AquaPhoenix

C-7518 Dissolved Oxygen Comparator is a component of K-7518 Dissolved Oxygen CHEMets Visual Test Kit and is designed to be compared against the color formed in R-7512 Dissolved Oxygen CHEMets Refill. The comparator's range is applicable to many industrial applications. Color standards are pink in color and cover a range of 5-180 ppb Oxygen.

TKCASE050 Test Case: Single Parameter holds 4 reagents by AquaPhoenix

Durable molded plastic; test kit box with 4 compartments. Measures 7.75" × 3" × 4.5"

AI2910 CalPod Solution Organizer by Apera

The Apera Instruments' unique CalPod helps users organize all the solutions in one place and create no more mess in the calibration process. The CalPod can hold up to 4 types of different solutions simultaneously. The hole in the center of the CalPod is for users to place the electrode. This CalPod is a great accessory for pH meters and all other kinds of meters that require regular calibration.

After calibration, close the lids so the solutions can be used multiple times.

Stickers for commonly used solutions for pH and conductivity testing are included. Blank stickers are provided for users to write special solutions' names.

• Say goodbye to all the mess during calibrations
• Simply organizing all calibration solutions into one place for multiple uses
• Label Stickers included in the kit
• Easy to rinse off

AI1126 pH 8.00 Calibration Buffer Solution 8oz by Apera

The Apera Instruments pH 8.00 Calibration Buffer Solution is standardized against NIST certified pH references within 0.01 pH at 25°C (77°F). It's ideal for the calibration of pH meters that have customized calibration functions (e.g. Apera PH800, PH820, SX811).

pH value is affected by temperature variations. 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.

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
• Double-sealed, 2-Year shelf life
• Expiration date and Temperature/pH reference chart provided for reference
• Non-hazardous product (MSDS is downloadable)

K-9610W Sulfite in White Wine Titrets® Test Kit (10-100 ppm) by AquaPhoenix

Each set comes in a cardboard box and contains everything needed to perform 10 SO2 tests: ten ampoules, ten valve assemblies, and instructions.

Increments: 10, 11, 12, 13, 14, 15, 16, 18, 20, 25, 30, 35, 40, 50, 70, 100 ppm

Features of Titrets Titration Test Kit Technology:

• Dependable, sealed single-use titrants
• Fast, easy procedure -- no need to count drops
• No burettes or other equipment necessary
• Perform a titration ANYWHERE