$100 - $150

94124 2" UHC/LPR Filter by Celestron

Our 2" Light Pollution Reduction (LPR) Filters are designed to selectively reduce the transmission of certain wavelengths of light, specifically those produced by artificial light. This includes mercury vapor, and both high and low pressure sodium vapor lights and the unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e. sky glow).

The new ultra high contrast (UHC) LPR filter has improved contrast over the typical broadband filters. Sky background is darker, and contrast of emission nebulae are noticeably improved. The advanced technology coatings enable the filter to achieve an outstanding transmission of over 97% across the entire bandpass, with total blockage of prominent light pollution lines. The perfect filter for viewing nebula from light polluted skies, or for boosting the contrast of nebula from dark sky sites.

In addition to it's optimum spectral and optical characteristics, the UHC/LPR filter offers important features that set it apart and result in the highest quality celestial views:

The multi-layer dielectric coatings are plasma assisted and Ionbeam hardened using the latest technology for durability and resistance to scratching.

Improved transmission translates to maximum image brightness and contrast. Users of smaller, 4"-11" telescopes will especially appreciate the high efficiency, and larger scope users will love the rich star fields and detailed subtle nebular shadings that are left intact.

The high transmission, sharp cutoffs, and more moderate 60nm passband of the UHC/LPR filter retains a more natural view, yet significantly boosts overall contrast. Imagers will appreciate the broader bandpass and inclusion of an extremely efficient H-Alpha passband (656nm).

146401 Iron Test: Hach Color Disc 0.2-10 mg/L Fe by AquaPhoenix

Using the simple color disc method, this kit measures Iron (medium range: 0.1 - 4 mg/L) and contains reagent for 100 tests.

• Simple, low-cost color disc method is the most accurate visual test kit method
• Kit contains all required reagents and apparatus in a rugged carrying case for analysis in the field
• Quickly and accurately measurei iron in the field or in the lab

Includes one reagent, two color discs, comparator box, two viewing tubes, instructions and carrying case.

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

90447-48 RTD Probe 1/4" OD 11" Lengt Miniature Jack by Digi-Sense

Resistance Temperature Detectors, or RTDs, are used in many process and laboratory applications where accuracy and repeatability are of prime importance. RTD elements are available in many different materials and with different temperature coefficients. The most commonly used element is a wire-wound platinum element, conforming to the DIN standard and with a .00385 temperature coefficient.

Key Features

• All probes are low range
• 316 stainless steel sheath material
• Extension leadwire transition with relief spring (350,°F)
• 3-wire RTD, 100 Ω
• Accuracy ±0.1%
• -328 to 400°F (-200 to 204°C)
• .00385°C temperature coefficient
• Constructed using PTFE Insulated silver plated copper internal leads

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

147011 pH Test Kit: Hach Color Disc 4.0-10.0 pH (Wide Range) by AquaPhoenix

Most natural waters range from pH 4 to pH 9, but commonly are above pH 7 because of carbonates and bicarbonates (alkalinity). The pH of water used in industry, boiler feed water, and swimming pools usually is kept within a narrow range. Simply add indicator to the sample and compare the color to the spots on the color disc to measure pH.

• A wide range kit applicable to a variety of samples
• A great option for fast, reliable readings

Includes indicator reagent, color disc, comparator box, two viewing tubes, instructions and carrying case.

0590 7502 750-2 Voltage, Continuity, Phase Sequence Tester with GFCI Test & Flashlight by Testo

The testo 750 voltage testers are the first instruments to include an all-around viewable LED voltage indication. All three models include low input impedance, phase sequence, continuity test, and meet CAT III 1000 V CAT IV 600 V safety standards.

The testo 750-2 includes a single probe voltage testing, built-in flashlight, and GFCI test function. The 750-2/-3 can perform GFCI Circuit tests on AC outlets. When performing a GFCI circuit test, a 35 mA load is applied to the circuit.

The testo 750 vibrates ensuring that the GFCI circuit test is active. In addition to the above features, the testo 750-3 includes a 3-digit LCD showing the actual voltage measurements.

Testo's history of efficiency, innovation, and quality now extends into the entire electrical lineup. Once again, Testo brings high value, feature-packed products to the HVAC contractor market.

• GFCI Test Function
• Patented all-around viewable LED voltage bar indication
• 0 to 690 V AC/DC voltage measurement
• Polarity detection for VDC measurements
• Phase sequence test for determining motor rotation
• Two handed operation with anti-slip rings for safer voltage measurements
• Built-in flashlight for testing in dark places
• Continuity test with audible and visual indications
• Dust and water protection to IP 64

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