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Great Quality, Great Price By Griseum on 1/9/14Griseum would recommend this product to a friendThe build quality seems to be on par with any other (more expensive) ORP probe. Have not had any problems like unusual spikes or drops, Comes very well packaged and protected (especially the electrode). Calibrated easily with the 400mV solution available from BRS.
Good buy By Z on 10/23/13Z would recommend this product to a friendAppears well made. Decent price. Running this on the Apex controller. Gave what appear to be normal readings within a day or so. Starting using Ozone with prior readings in the 230 range and now up above 300 within a week.
You get what you pay for! By Andy on 8/15/13Andy would recommend this product to a friendExcellent quality. Reading is very steady. Does not jump around at all like the other cheap probes I have used. Very accurate and craftsmanship is of high quality. I will come back for these when I need another replacement. High quality just like the expensive probes, but with a nice price tag!
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BRS Lab Grade ORP Probe Features:
Double Junction Probe: A double junction probe has a second seal and junction found at the center of the probe. The double junction design adds to the cost and complexity of the probe but they are recommended in instances where the probe will come in contact with proteins or heavy metals. When these elements come in contact with the silver within the probe gel they can precipitate on the porous junction and clog it which can cause drift and shorten the life of probe.
The double junction design used in this probe has a second junction in the center of the probe which creates two chambers within the probe. The first one is filled with the reference gel containing mostly potassium chloride, silver chloride and reference probe. The second chamber has just reference gel containing mostly potassium chloride. This design prevents precipitation by keeping the silver away from the second porous junction at the bottom of the probe which is exposed to the aquarium water.
The BRS Lab Grade probe uses pelon strips as a junction material which is a true electrochemical insulator which allows a complete circuit between the reference probe and the tank but allows a very minimal transfer of elements found within the probe or tank. The pelon strip is also much easier to re-wet than the ceramic junctions in the case of accidental drying out of the probe.
The BNC connector is also made to higher quality specifications with superior insulators between the shell and center pin to reduce noise and increase accuracy. The outer shell on the BRS Lab Grade Probe is made using epoxy rather than less expensive polycarbonate which is what most probes use because it is the most inexpensive material available. The epoxy shell is a highly resistant material and inert to a wide range of materials making this one of the more chemically compatible options available for probes like this.
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