How to measure buoyancy of multiple items at home (without fancy lab equipment) I am a scuba diver and, hence, need to take into account how buoyant the materials are I take with me into the water. Given that I have a LOT of diving equipment, it is practically impossible to test the buoyancy of all of my materials while diving. 
Therefore, I am interested in figuring out the buoyancy (in grams) of each of these items (different lights, several sets of undergarments, et cetera) separately, in the comfort of my home. 
What I am looking for is some kind of experimental setup that allows me to measure the buoyancy of each item (accurate to, say, 100 grams or so) at home, using items I have available at home (so without the luxury of access to a science lab). 
I have contemplated filling a bucket with water and then inserting each item (possible made more heavy by adding weights on top, is the item is fully positively buoyant) and measuring the weight of the water that flows of the bucket, but I don't know how to do this practically (for example, how do I actually weigh that water correctly, and how do I remove the bucket that contains the item without spilling more water, et cetera). So, I am hoping there may be a more practical way of measuring buoyancy of each item, only relying on material that I have in my home. 
Does anyone have some ideas how to make this practically feasible?
Steve
 A: You should find the volume of your objects and then do the necessary arithmetic which takes account of the water into which you are diving to fine the buoyancy.
If the objects sinks that is relatively easy because all you need to do is fill a bath with water and weight the object (luggage scales) when in air and when immersed in water.
The difference in the two readings in $kg$ can then be converted into a volume by noting that a difference of $1000 \, \rm kg$ represents a volume of $1 \, m^3$.
You could use a more accurate value for the density of water by measuring the temperature of the water in the bath and looking the density up in the appropriate text.  
If the object floats then you can add weight(s) to just sink the sink the object but if this is difficult then add a weight which sinks the object and then use the luggage scales to find find the volume of the object and the added weight and then repeat the process with the added weight alone to find its volume.
The upthrust (buoyancy) is equal to the weight of water displaced and I do not think you need to make any correction for using mass rather than weight in your calculations.
The salinity and the temperature of the water at your diving location should possibly be taken into account?  
Update as a result of a comment.
For an object which sinks:
scale reading with object in air (kg) - scale reading with object in water (kg) = mass of displaced water (kg)  
$\dfrac{\text{mass of displaced water (kg)}}{1000} = \text{volume of object }(\rm m^3)$  
assuming density of water is $1000 \, \rm kg\, m^{-3}$  
For an object which floats.  
Find the volume of an object which floats:
Use the above procedure to find the volume of the weight used as the "sinker" alone and then the volume of the object and the "sinker" but make sure that the object and the sinker are totally immersed in the water.  
There are a lot of experiments to find densities using this method eg here and you are using a known density to find a volume. 
A: 
weigh that water correctly

Well, since Archimedes principle states that buoyancy is equal to the weight of the water displaced, to measure the weight of the water displaced, we can use the classic experiment of placing the bucket filled full to the brim in a larger, empty basin.  Then we insert the object into the bucket, and the displaced water will flow into the basin.  All we need to do then is to remove the bucket, measure the mass of the basin(with water), and subtract the mass of the basin alone.

how do I remove the bucket that contains the item without spilling more water, et cetera)

This is impossible to do so what you can try is to be as careful as possible.  After all, human error cannot be eliminated, only minimised.
A: Get a hanging spring scale--they're cheap.  Then just set the scale up over a bucket and weigh each item when it is submerged in water.  If it floats, add weight until it sinks, and then subtract the weight (in water) of those added weights from the weight shown on the scale.
