Garnet SeeLevel II 709 Monitoring System

New to RVing with a TT, I hated the standard tank level indicator Leds that were never accurate. My brother told me his Tiffin Alegro Bus had this SeaLevel II system. I researched it, ordered a 3 tank 709 system and installed it on my TT. I mounted 2 Displays - one outside in my TT's utility area and one inside the TT. We took a 5 day trip over Labor day and this new system worked perfectly. Wow .... I now know just what level my tanks are at. I started the trip with a 20% water/chem solution in my Black tank. The LED indcated 1/3 full. We drive 3 hours and when we got to Fort Wilderness and set up I checked the Tank levels - Black tank still indicated 20%, but the LEDs now indicated 2/3 full. Nothing was put in the Black tank, the leds (inside tank sensors) were wet from the trip and were giving false readings. This is a Great Product.

Ingenious design that works! You can usually get spot-on measurements at either the full or empty levels of the tanks but would be lucky to get a precise reading at both ends of the spectrum. Much of this shortcoming is due to the fact that the tanks are seldom manufactured in a box-shape. Most often they are "wedges". This introduces differences in the %-full readings depending on which side of the tank the sensors are mounted on. Of course this is not the fault of the sensors, merely the reality of the situation.

One other tank peculiarity is that some black or gray water tanks have a radius bottom which forces the sensor to be placed higher on the tank which lessons the sensitivity of the measurement until the contents reach the bottom of the sensor. Again, not the fault of the sensor, only the reality of the situation.

With a series of temporary sensor placements (highly recommended), this system will perform better than any other tank monitor I have seen in 25 years. Mine are placed so they are the most accurate for the fresh water tank as it approaches empty. The black and gray water tanks sensors are placed so that they are the most accurate when they approach full. Infinitely better knowing a % full or empty rather than the antiquated idiot lights installed by most manufacturers.

Really a great product.

In my trailer (which i didn't check before ordering) the tank heights (outside) are 4 (gray water), 5 (fresh water), and 8 (black water) inches. the standard sender that came with the unit (cut to 7.5 inches) works well on the 8 inch tank, not at all on the other two. replacing the one i had with the 6 inch long model (cut to 4 inches) worked with the 5 inch tank. there is no way to make the system work with the remaining 4 inch tank. Still, having more or less accurate (at least repeatable) indicators on 2 tanks is worth the money to me after 20 years of dealing with the completely useless system that came with the trailer. Check your tank heights before ordering. Getting information from garnet is rapid and accurate.