This is the glass tube you see the Maple Syrup makers use to test the syrup for sugar content when they are making syrup. I have note syrup with a hydrometer so I am not sure how this technique works. When the color is right for me I take it off the fire. You can't sell the stuff without a license anymore so it is all personal taste. Dark, dark caramel for me please.
By the way I got the idea from one of these hardcore syrup makers and didn't see it here so I am passing it on.
The hydrometer is used by by spirit makers to judge the amount of sugar content in a mash, and to used the beginning and end readings to estimate the alcohol content. The reading is taken at the start of the ferment ( say 15%). The reading is taken at the end of the ferment, or during (say 5%) these readings are subtracted to get the estimated alcohol content of the mash (fermenting mixture) 15 - 5 = 10% alcohol - Approximately.
Hydrometers are used by seafarers to test the density of the water they are floating in. This is very important to them, as when a ship travels from fresh sea water (more dense - more buoyant) to fresh water (less dense - less buoyant) the ship will sink further into the water, changing the draft of the vessel ( the vertical distance of the ship's hull under water). The name of the game is to carry the maximum amount of cargo without going over the maximum allowable draft. So if you test the water and it is a little fresh, and you know the density of the water will be greater at the place where you have a set draft ( say a lock). You know you can load a little deep, because the ship will rise up. There are many calculations unique to every ship that must be used to figure it out. Once you know what you are doing it is easy, like everything. Mistakes can cost you your job though as penalties for going over are high (sometimes in the 6 digits) causing big losses in profit for the company. You don't want to screw up too many times.
Anyway, this is an Instructable on how to make a very sturdy case to protect this fine instrument.
A hey you can do it with old recycled copper pipe - Another contest entry. Whooo Whooo