$200 - $300

Part Number: F105325PM78

3621 Industrial pH/ORP Controller, LCD Display, 1/8 Din Panel Mount by Jenco

• Easy to install 1/8 DIN plastic casing.
• Clear LCD displays pH, mV or temperature with backlight.
• Universal power supply input from 100-240VAC.
• Automatic buffer recognition of US and NIST buffer sets. Calibrated data is stored in memory and ready to for use on power up.
• Automatic or manual temperature compensation.
• Displays absolute and relative ORP.
• Two sets of programmable on/off relays for pH or ORP (3621).
• Isolated and reversible 4-20mA current output for pH or ORP allows it to be used as a proportional output (3631).
• RoHs compliant.

94303 1.25" Eyepiece and Filter Kit by Celestron

• This 1.25" Eyepiece & Filter Kit includes fourteen (14) accessories that will add new life to your telescope and your observing!
• You'll get five quality Plossl eyepieces, a 2X Barlow Lens, six colored filters to improve observations of the planets, a Moon filter, and a foam-fitted aluminum carry case with extra room to grow.
• Five eyepieces and a Barlow lens equals ten different magnifications to choose from, including the equivalent of a 3mm, 4mm, 6mm, 6.5mm, 8mm, 8.5mm, 13mm, 16mm, 17mm and 32mm. And that doesn't include eyepieces you may already have in your collection, which will now achieve double the magnification with the addition of the Barlow.
• A Moon filter will increase your enjoyment of lunar observations by dimming the brightness and increasing contrast
• The most popular planetary filters are included in this kit. Have fun seeing what a blue filter will reveal about Jupiter, or unveil the polar ice caps on Mars with a red or orange filter.

The Celestron 1.25" Eyepiece and Filter Kit is a great way to expand the functionality and enjoyment of your telescope. Inside the metal, foam-lined carry case you'll find these accessories:

• 32 mm Plossl Eyepiece - 1.25"
• 17 mm Plossl Eyepiece - 1.25"
• 13 mm Plossl Eyepiece - 1.25"
• 8 mm Plossl Eyepiece - 1.25"
• 6 mm Plossl Eyepiece - 1.25"
• 2X Barlow Lens - 1.25"
• #80A Blue Filter - 1.25"
• #58A Green Filter - 1.25"
• #56 Light Green Filter - 1.25"
• #25 Red Filter - 1.25"
• #21 Orange Filter - 1.25"
• #12 Yellow Filter - 1.25"
• Moon Filter - 1.25"

2X Barlow Lens - The included, and very versatile 2X Barlow doubles the magnification of any 1.25" eyepiece. Since this kit includes five (5) eyepieces, you will be able to use them with and without the Barlow, giving you a total of ten magnification options in all. Any other 1.25" eyepieces you already have will also work in this desirable accessory, giving you even more magnification choices. Remember, high magnifications do not always produce clear, sharp results, especially on evenings of poor or moderate seeing conditions. Experiment to find the magnifications that are best for your telescope on a particular night.

Filters - Colored filters can be used to bring out certain details on a planet's surface or its cloud structure. All of the planetary filters included in the 1.25" Eyepiece & Accessory Kit, as well as the Moon filter, can be used on any 1.25" eyepiece with the proper filter threads, so they are very versatile. Just screw one onto your eyepiece of choice and slide it into the focuser.

The Moon filter is one of the first accessories most new amateur astronomers buy, and for good reason! It helps block out a portion of the light the Moon sends into your eyepiece so that you can see details better. You can also try this filter on Venus; it blocks enough glare so you can observe the planet's phases more easily.

Metal Case: The sturdy metal carry case has die-cut foam inside to protect and cushion your accessories. Store each one in its appointed place when not in use and you'll keep them looking and performing like new. The case is even large enough to carry a few extra accessories. Just pull out enough of the foam cubes to make a nest for your eyepiece, camera adapter, etc. A tight fit is better, so remove the least amount of foam possible before testing the fit. You can always remove more if you need to.

791JC Panel Mount Digital Temperature Transmitter with 4- 20 mA Current Output, Type J by Jenco

Panel mount digital temperature transmitter with 4- 20 mA current output that allows the 791 to drive any loop powered process indicator or recorder. Current output has expanded or normal switch for user adjustable center point and span control for temperature to 4-20 mA output and features a LCD display & 1/8 DIN Aluminum case. Types. J, K, T, 3-wire Pt-100 RTD, specify °C or °F. Ambient range 0 to 40°C. 115 / 230V AC operation.

• All solid state design
• Low power consumption ,reduced internal heating ,increased reliability
• High 50/60 hz noise rejection
• Heat cycled 100 hours before shipment
• Available for various thermocouple and rtd calibrations
• Easy to install
• Aluminum 1/8 DIN housing
• Isolated 4 to 20 mA output over span in nor mode
• 115VAC /230VAC operations

VK12TF-MPM-W 12" Versa-Kool Tent Fan, Wired Cord, Multi Bracket Pole Mount, All White by Schaefer

Schaefer pole mounted tent fans are ideal for tent cooling, heat circulation and detracting bugs. The all-white 12" fans blend in with most tents and are so quiet you don't hear them, you only feel them. Simply mount them on the tent side poles and turn them on. Use one tent fan every 15-20 feet.

Features and Benefits

• Mounts onto tent poles, saving floor space
• Wide variety of mounting options available for flexible and easy installation
• Quiet operation, high efficiency and output
• Easily stored and transported
• Misting kits available for even greater cooling

791LPTBF Panel Mount Digital Temperature Transmitter with 4- 20 mA Current Output, Type PTA, LCD Display by Jenco

Panel mount digital temperature transmitter with 4- 20 mA current output that allows the 791 to drive any loop powered process indicator or recorder. Current output has expanded or normal switch for user adjustable center point and span control for temperature to 4-20 mA output and features a LCD display & 1/8 DIN Aluminum case. Types. J, K, T, 3-wire Pt-100 RTD, specify °C or °F. Ambient range 0 to 40°C. 115 / 230V AC operation.

• All solid state design
• Low power consumption ,reduced internal heating ,increased reliability
• High 50/60 hz noise rejection
• Heat cycled 100 hours before shipment
• Available for various thermocouple and rtd calibrations
• Easy to install
• Aluminum 1/8 DIN housing
• Isolated 4 to 20 mA output over span in nor mode
• 115VAC /230VAC operations

600-0027-000 Isobutylene, 2,000 PPM (Balance Air), 34L Steel Cylinder by RAE Systems

Standard single-gas and multi-gas mixtures for monitor calibration

• Sizes range from 11 liters to 103 liters
• Convenient multi-gas mixtures
• Choose between demand-flow and constant-flow regulators

93831-73 Bendable RTD Probe, 100 Ohm, ANSI 3-Blade Connector, 10" L, 5ft Coil Cord by Digi-Sense

Maximum error for probe assembly is ±1.1°C + 0.12% of reading below 300°F, ±0.35% of reading above 300°F. Alpha coefficient is 0.003850 Ω/Ω/°C (DIN IEC 751). Resistance at ice point (0°C) is 100 Ω.

Note: Time constant is the time required to reach 63.2% of the new reading. To determine how long it will take to reach 99% of the new reading multiply the time constant by five.

Note: The temperature range is for the probe tip only. The handle material may be affected if the probe is rated higher than the handle depending on exposure time, application, and handle material. ABS handles are rated to 220°F (104°C); PVC handles are rated to 200°F (93°C); Stainless Steel handles are rated at 450°F (232°C); Mini Connectors are rated to 392°F (200°C).

• Time Constant: 1-3 seconds or greater
• Custom designs or changes to this product are available upon request

*Please note we can only ship RKI products to customers within the United States

Part Number: 34L-477

Part Number: 44L-473