SpectraPure® LiterMeter 3 Top-off Control Module (LM3-TCM)

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This item has been discontinued.


The SpectraPure® LiterMeter 3 Top-off Control Module (LM3-TCM) is designed to be used with the SpectraPure® LiterMeter 3 dosing pump for aquarium auto top-off. Will automatically turn off the LiterMeter 3 once the set level is reached.

Manufacturer Info

SpectraPure Aquarium Supplies
SpectraPure was established in 1985 and is located in Tempe, Arizona, home of Arizona State University. SpectraPure is dedicated to excellence in the design and manufacture of water filtration and purification systems for household, commercial, laboratory and light industrial applications. Their product lines includes a full range of systems and equipment, including drinking water systems, water softeners, filtration systems, reverse osmosis units, RO/DI and deionization systems and many other technological innovations and water purification accessories. SpectraPure provides innovative, state-of-the-art solutions to water purity problems and applications.


1 year manufacturer warranty



Experience Level: Expert

Not very precise

Overflow protection? Yes. Top-off control? Not really. I purchased an LM3 for the dual purposes of dosing and top-off control. The LM3, itself, is a work of art. Beautifully built, works to perfection. The top-off control module, however, lacks the sensitivity to provide accurate level control. In order to trip the pressure switch, the water level has to change by about 1" to 1.25". This is fine if one is using it solely to prevent overflows in the sump or the tank but way too much variation for level control. This is a disappointment from a company with such a fine reputation. I wrote to Spectrapure about this and got a note back saying that the "Top-off Control Module" is not really meant for top-off control. Go figure why they name it and advertise it as such... Bottom line: If you want a precise top-off control, get the Spectrapure Ultra Precise Level Controller.

6 out of 7 found this review helpful

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JDN from


Experience Level: Intermediate

Great device

I have been using this product for just over a month now and it has worked flawlessly. Very easy to set up.

1 out of 2 found this review helpful

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B T from


Experience Level: Intermediate

Litermeter ATO

The application works great. The power for the litermeter 3 pump plugs into the ATO, and that plugs into the litermeter 3 power inlet jack. 60 second setup and have done nothing since, nice addition.

1 out of 3 found this review helpful

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