The real price is about 40 USD plus shipping . I am currently too busy, selling only for request. Sending time 2-3 weeks.

WLI TWIN requires the installation of two pieces of tank transmitter/measuring sensors (Not included!) for example Votronic Tank Electrode 15-50 K or Tank Electrode 12-24

Contact me before buying please. Even if device is on eBay pages it is not always on stock or maybe I'm somewhere in camping!

Without contacting me before buying is handling time 20 working days!

single version: https://www.ebay.com/itm/303742862479?ssPageName=STRK:MESELX:IT&_trksid=p3984.m1555.l2649

- available colors are black or white (touch areas are always black)

Features:

The touchpad on the left side has ON/OFF function

The touchpad on right side switch WLI input between Fresh and Gray water tank/ or settings

Comparing to “standard version of WLI” has WLI TWIN these features:

  • WLI TWIN requires two measuring sensors to display two different values of water level. One situated in Fresh water tank, second situated in Gray water tank. (Black water tank on individual request)
  • Current in “Off mode” is a bit higher comparing to WLI due to circuit changes.
  • Board voltage is displayed. If voltage is outside 11,8V to 14,8V the value is displayed red and blinking.
  • Built in input protection for voltage over 5V. (Maximum measurable input value is still 5V)

Hundred levels are displayed. 1-100% graphically and numerically. (similar products displays only 5 to 10 level)

The WLI (Water Level Indicator) had been designed for precise level measuring of supply water tanks in mobile homes, caravans and boats. The mounting depth of 20 mm of the electronic system allows flush mounting into commercial furniture boards to ensure, that an optimum installation place can always be chosen without losing precious storage space.

The WLI device is equipped with ON / OFF touch area instead of mechanical switch due to faults minimization.

Measure input signal 0 - 5V. Customer has possibility to set MAX and MIN water level. (Input default value MIN 0V, MAX 2V as Votronic Tank Electrode)

Possibility to view tank volume in Liters,Litres or Gallons. 

OFF current consumption: Votronic max 3mA,  WLI TWIN max 210 uA at 13.8V. BTW the current 210uA is less than the self-discharging battery current of most battery types.
ON current consumption 120mA.

Sensitivity 1% accuracy -+2% at 11V to 13.8V (normal voltage for 12V car accumulator)
Not suitable for 24V system!

- possibility to program WLI specially for you and your irregular form of water tank

More specification on project home page or as me. (I designed and produced it and there is no one who knows more about it than I do.)

User manual you can find on kuzytronic home page.

Note:
Capacitive type sensors sensitivity (the WLI was designed for) is typically  2mm only.
The ultrasonic indication is not very accurate (about 2.5 cm/1 inch) and not suitable for permanent operation for humans or animals. Therefore, I recommend to use the device with a capacitive level sensor as Votronic Tank Electrode 15-50 K or Tank Electrode 12-24 K is.