I have a LiterMeter III for sale.
I am pretty sure it has never been used.

You can read all about the LiterMeter here.
The new SpectraPure LiterMeter III™ is an automatic precision dosing system for the aquarium and horticulture industry. Three independent programs control one built-in pump and up to two external pumps. Perform 2-way water changes, in addition to eliminating the manual drudgery of dosing Kalkwasser, trace elements, or topping off evaporated water. Quiet operation, auto-calibration, and virtually maintenance-free.

Calcium maintenance and alkalinity control are essential for a healthy reef tank. SpectraPure’s LiterMeter III™ eliminates the manual drudgery of dosing Kalkwasser, trace elements, or topping off evaporated water. Kalkwasser replenishment, to be most effective, should be added to your aquarium slowly and consistently to avoid precipitation of calcium carbonate. The LiterMeter III™ automatically and reliably performs this task for you.

The LiterMeter III™ offers features found only on expensive laboratory pumps. Built-in calibration features eliminate the guesswork of uncalibrated competitive units. Unlike noisy industrial metering pumps sold to the aquarium trades, SpectraPure’s LiterMeter III™was specially designed for critical aquarium dosing and is so quiet you can use it in your living room. Superior three-roller direct-motor drive eliminates noisy gears and improves flow accuracy and tubing life. It can be run dry without damage, and pumps either from a draw height of 12 feet or to a delivery height of 16 feet.

Three independent programs control the internal pump, as well as two optional external pumps.

* Quietest pump on the market; excellent for reef tanks
* One internal pump provided with unit, remote pumps optional
* Fully automatic pump operation—Set it and forget it
* Precision calibration feature eliminates guesswork
* Dependable and virtually maintenance free
* Self-priming and Anti-siphoning
* Compact size and cool operation
* Uses less than 6 Watts of power when operating
* Precision dosing system can be powered directly from a 12VDC battery
* Highest quality precision dosing system—incomparable accuracy
I will ship this item. This item sales around $350. (The cheaper ones, are just add ons to this.) I'm asking $250.