$150 - $200

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

1-Phase/Single-Speed Motor, 1/100 Hp, 115V, 60 Hz, White, with 6' Cord, 1550 rpm

90551-39 Sil-Filled Bottom-Con Bimetal Thermometer, 3" Dial, 24" L/0-250F/-20-120C by Digi-Sense

Accuracy is ±1% full-scale when stem is immersed 2" in liquids or 4" in gases (immerse models with a 2.5" stem length 2" in gases). Measured stem length from the top of the threads to the bottom tip of the stem. Stem dia is 0.25"; threaded connection is 1/2" NPT(M). All thermometers meet or exceed ASME B40.3 standards. Maximum environmental temperature for Acrylic lens thermometers is 200°F (93°C).

• Dampened movement
• Anti-parallax dial for accurate readings
• Hermetically sealed per ASME B40.3 standard to prevent fogging and protect against tough environments
• Rugged 304 stainless steel construction with Acrylic lens
• Recalibrate using the external reset screw
• For use in applications that do not exceeding 200F

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

Part Number: J126525LM2

*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

AI3106 LabSen 551 PVC-body Spear pH Electrode by Apera

Built with proprietary sensor technology and premium materials from Switzerland, Apera LabSen 551 PVC-body pH Electrode is designed for direct soil testing and soil slurry testing.

LabSen S-type spear glass membrane - low resistance and high firmness, rendering fully stabilized readings in 15 to 30 seconds, and is yet 10 times stronger than traditional glass membranes, highly resistant to general impact, eliminating the chance of accidental breakage when inserting into the soil.

Open&Ceramic double-junction with Polymer electrolyte - ensures full contact with test samples while minimizing junction clogs. No need to refill electrolyte.

Long-Life Reference System - composed of a glass tube, AgCl, and a reference silver wire. The top end of the slim glass tube is stuffed with cotton, which prevents the reaction between AgCl and electrolyte when the temperature changes. It improves the stability of the reference system and extends the service life of the electrode.

The electrode uses a standard BNC connector, compatible with any pH meters that use BNC connectors. No temperature sensor is built-in. Users need to have a separate temperature probe (ex: Apera MP500) to enable ATC or manually input temperature to achieve temperature compensation.

• Spear sensor designed for direct soil pH test and soil slurry test
• LabSen S-type glass membrane, featuring fast response and high firmness
• Open&Ceramic double-junction with Polymer electrolyte
• Long-Life Reference System - improves the stability of the reference and extends the electrode's service life

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

93522 Dual-Axis Motor Drive for CG-4 Mounts by Celestron

Add tracking and tracking correction capabilities to any setup that uses a Celestron CG-4 equatorial mount. The right ascension motor drive allows the telescope to track a star's movement through the night sky, and the addition of a declination motor gives you the ability to make adjustments in all four directions with the included drive corrector hand controller.

With this drive system mounted on a properly polar-aligned telescope, the user can do visual observations or sketches without objects constantly drifting out of the field if view. Astrophotography is also possible when a mount has dual-axis drive with drive corrector capabilities.

The Celestron dual-axis motor drive system is powered by four D-cell batteries in a self-contained battery pack. The drive can be used in either the Northern or Southern Hemisphere. To change hemispheres (reverse the motor's direction), simply flip the "N/Off/S" switch on the drive corrector hand controller.

The drive corrector hand controller can be used to move the telescope at different speeds. This is achieved by choosing the desired speed on a switch marked "2x/4x/8x." Twice the sidereal rate, or 2x, is used for guiding on a star when doing astrophotography. The 4x speed is used to center objects in the eyepiece. The 8x speed can be used for centering objects in the finderscope as well as the eyepiece.

This package includes an RA and Dec motor, clutch, mounting brackets and hardware, drive corrector hand controller, and power pack.