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Old 08-30-2014, 11:59 PM   #15
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1989 34.5' Airstream 345
Saint Petersburg , Florida
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Originally Posted by lsbrodsky View Post
I saw an ad for Truma in a mag recently and bought one. They are a well established German RV company and this device is a little handheld sonic detector. It seems to work well on a clean tank but gives false negatives on a dirty tank. So it is fine for my AS tanks, not so good for a bbq grill tank stored outside.
You may ask why bother...I like to start trips with two full tanks but I want to know whether I really I really need propane in the in service tank without having to wrestle it down and weigh it. Perfect device for the job!

Possible that you could tell me how this device was listed in the Magazine, or even the Product name from the box it came in?
Thanks, Derek

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Old 08-31-2014, 04:06 AM   #16
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It is called the Truma Levelcheck and you can find it at


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Old 08-31-2014, 05:59 AM   #17
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1997 25' Excella
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I fill propane tanks here at the shop and seen various kinds of these, however after time or a slight "dropping" of tanks they seem to read inaccurate. I can only agree with Phoenix, the tare weight is stamped on the tank (TW) and depending on your tank size, being a 30# or 40# add the (TW) to the tank size and you will have the full limit of your tank. You should not have to write anything down, unless the filler is not giving you your moneys worth. A bathroom scale will work for this just fine. A 30# tank when full should be about 54 lbs. Aluminum of course is lighter and the TW would show this.
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Old 08-31-2014, 06:39 AM   #18
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You can get a double bung tank with a float gage in it.

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Old 08-31-2014, 09:11 AM   #19
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Erie , Colorado
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I've got the MOSCAP tank ultrasonic checker and it works well.

Also have heard that an IR thermometer will work. Just need to have some propane being used. When gas is flowing the propane will get colder.

And the most accurate way as previously mentioned is weight. 50# fish scale will do fine since most tanks empty are about 23# or so, at least the ones on late model AS.
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Old 08-31-2014, 09:29 AM   #20
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Yes weighing is the most accurate, but my objective was to avoid having to disconnect and lift the tank off of the A-frame. The ultrasonic sensor is a more elegant and less physical solution for me.

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