$200 - $300

WD-35808-72 Double-junction, Epoxy-body, Gel-filled pH Electrode by Oakton

Built-in temperature sensor lets you take ATC readings with a single probe

All-in-One Waterproof electrodes feature a built-in temperature sensor for taking readings with Automatic Temperature Compensation (ATC). Choose a single junction electrode for field, clean water, and general purpose applications. Choose a double junction electrode for most applications, including dirty water, heavy metals and organics applications.

Each electrode is 12 mm dia with a 3 ft cable.

• Includes a FREE electrode saver bottle to extend electrode life
• Feature a BNC connector for pH and a waterproof 6-pin connector for temperature

691N 1/8 DIN Panel Mount pH Transmitter with Calibration by Jenco

1/8 DIN panel mount pH transmitter with calibration by potentiometers. Has a manual temperature control knob and normal transmitter output of 4-20 mA output for 0-14 pH range or in expanded mode 4-2mA can be for any 2 pH units from 0 to 14 pH. Features a large bright red LED display. Connectors are a BNC pH input and spade lug screw type connector block. 115/230V AC.

• Current output with selectable span for better accuracy
• Manual temp. compensation
• 0.56 high efficiency red led display
• Low power consumption
• Reduced internal heating for increased reliability
• Heat cycled 100 hrs
• Isolated 4-20 mA output span of 0 to 14 pH over any 2 pH

Part Number: M101635PA

Part Number: 58L-432

Part Number: M10164500PM2

Part Number: 44L-457S

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

Part Number: 58L-402E

93454 Ultima Edge - 30mm Flat Field Eyepiece - 2" by Celestron

See the whole picture with Ultima Edge. These flat-field eyepieces were designed to provide an ultra-sharp, ultra-clear, crisp image from the center all the way to the edge of the field of view. The 30mm Ultima Edge eyepiece features fully multi-coated optics and a 9-element, element lens design, maximizing light transmission.

The Ultima Edge 30mm has a generous 70° field of view perfect for viewing planets, stars and the Moon's surface. This eyepiece provides low power magnification, perfect for deep sky objects and a bright detailed view of the moon's surface.

Body

The 30mm Ultima Edge eyepiece's main housing is machined from high grade aluminum with a black anodized outer surface.

Its 2" mounting barrel is internally threaded to accept standard 2" filters and adapters. It is compatible with 2" star diagonals and focusers. On the exterior of the eyepiece, you will find a uniquely designed, molded rubber grip ring for non-slip handling during observing sessions.

Viewing through the 30mm Ultima Edge eyepiece is comfortable for both eyeglass wearers and non-eyeglass wearers alike, thanks to the rubber eyecups and long eye relief of 22mm.

Convenient Parfocal Design

Spend more time observing and less time focusing! When you buy more than one Ultima Edge eyepiece, you can switch between them without refocusing thanks to their parfocal design. With a set of Ultima Edge eyepieces in your kit, you'll be able to enjoy a wide range of high and low power views–and switch between them quickly and easily. That means you can get more out of every observing session.

NOTE: Ultima Edge 24mm is not a parfocal eyepiece. Ultima Edge eyepieces are only parfocal within the line and do not maintain focus when swapped with parfocal eyepieces from other brands or series.

• 30mm parfocal Ultra Flat Field eyepiece designed for 2" focusers
• Incredibly crisp views from center to edge of field
• Fully multi-coated, 9-element lens design for excellent light transmission
• Wide 70°; apparent field of view allows you see more of the night sky
• Generous 22mm eye relief and fold-down rubber eyeguard for comfortable viewing with or without eyeglasses
• Molded rubber grip ring for non-slip handling

Part Number: 34L-490

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

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