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The cord is right about 9ft long.
With proper care, the temp probes should provide years of service and do not normally need to be replaced.
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There should be a rubber end on the bottom of the. this does not need to be removed and the probe can be placed directly into the aquarium! Feel free to let us know if you have any further questions!
Placement can vary wherever you have room. Many people like to place it in a higher flow area to keep the tank level consistent. Feel free to let us know if you have any further questions!
To add a second temp probe you would need a probe module. The PM2 would work as well as the PM1.
The probe will work but likely wouldn't be the best choice for air. Water conducts heat much better then air so the probes for water have more mass to keep the reading from fluctuating wildly. Air doesn't conduct heat very well so temperature sensors intended for air tend to have very low mass, that way there is less material that needs to be heated for the sensor to recognize it. The bigger/heavier the probe the slower it will respond and less accurate it will be for air.
Great By Jason on 1/16/2017Jason would recommend this product to a friendI have multiple probes to monitor the tank, sump, and air temp. Probes can be calibrated with apex controller if needed. Probes have worked great for me and the apex controller lets me know if any of the temps get out of my set range.
Not well pre-calibrated, but good otherwise By Brian on 1/12/2016Brian would recommend this product to a friendI have two of these probes, one on the PM2 and one on the main controller. When they first arrived I had 3 degrees variability between them, not only were they different from each other but they were different depending on whether they were hooked to the PM2 or main unit. 3 degrees is a fair bit for something that claims pre-calibration, thus the 3 star rating. Calibrated both with a known good NIST probe (none were quite right, and the calibration was different depending on where they were hooked up), and they've been dead on for about 5 months now. So, once they get working, they seem to be pretty stable - I clean by wiping about once a month, but I'm not sure that's even necessary.
Second Probe added for PM2 By Polymorphyc on 6/17/2015Polymorphyc would recommend this product to a friendThe only reason I am giving 4 stars is because it is 0.5 degrees off from my other probe. They are right next to each other, so I would expect the same temp since they both came pre calibrated.
Ibought this as a conductivity By Roger on 2/23/2015Roger would recommend this product to a friendI bought this as a conductivity adjustment thermometer. IT works great and I would buy it again.
Accurate By Dr. P on 2/13/2015Dr. P would recommend this product to a friendThis was purchased to replace a probe on my Aqua Controller Jr. It calibrated very easily and seems to be working well.
Good for temperature control By Scubajoe on 1/6/2015Scubajoe would recommend this product to a friendI use this product to turn on and off my two heaters in my 18o gallon reef tank. I am very satisfied with its performance. I wish the end cap were not so fat. Does not fit in all holders unless I feed it from the back end. Aside from that no issues.
Love it! By Bridg on 1/5/2015Bridg would recommend this product to a friendCan't have a tank with out an apex on it! The temp probe and salinity is a must have!
2nd probe By Devo on 12/8/2014Devo would recommend this product to a friendi got this 2nd probe to put in my QT to help keep my temp in check and its doing great!
Nice Probe By Terri on 12/3/2014Terri would recommend this product to a friendAfter a little over a year, the probe which came with my Apex began showing large temp swings. I replaced the heater and there was no change so it had to be the probe. I ordered the replacement above. No more erratic readings! This probe is well built. The cord is very long which I needed!
Solid Product By JohnD on 7/13/2014JohnD would recommend this product to a friendI'm very pleased with this probe and it is definitely build to handle the harsh saltwater. I've been using Neptune temp probes for years and I've never had one fail.
Accurate By Reefsi on 4/20/2014Reefsi would recommend this product to a friendHave 2 of these both read within .2 of eachother at all times. Get a .4 higher reading than using the coralife cheapos which is strange but I know that the Neptune ones are accurate and well made.
Low Cost and Dependable By Jared on 11/14/2013Jared would recommend this product to a friendI have three of these units actively running. I calibrated each one via the web interface with a NIST-Traceable Temperature Probe. This neptune probe is made well, and all three have maintained their accurate values for well over a year of use so far. All three are submerged.