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The Ohaus 505-10 Portable Balance
These compact, low-cost balances are very sensitive yet easy to use thanks to the magnetic damping system. The two sliding weights are secured in place by deep beam notches and a large adjustable foot is used for leveling and zeroing. The 505-10 has a removable anodized scoop(approx. 8 x 6 x 2 cm deep ) allowing for easy dispensing of powders.
A portable balance for field work in biology, geology, earth science and other environment studies. Designed for use in arts, crafts and general hobby work where high precision is required. Total weighing capacity is 50.5 grams and has a sensitivity of 0.01 grams.
Convenient grams to grains conversion chart is affixed to the balance, ideal for the hunter and gun enthusiast in reloading their own ammunition. Other features include:
Permanent, self-regulating magnetic damping speeds weighing
Anodized aluminum scoop (8 x 6 x 2 cm deep) will not allow powder to stick
Non-tipping pan design
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In the video above we show ammunition reloading using the RCBS1010 (Ohaus made this model for RCBS and it is similar to the Ohaus 1010-10) wanting to weigh powder to a kernel they need to purchase The Sartorius Entris64-1S analytical balance that increments in 0.002 grain divisions/graduations. That is two thousandth of a grain.
Now just because a balance offers readability to 0.002 grain divisions/graduations does not mean it is accurate to ±0.002 grain. Readability is just what the balance's displays resolution. One needs to dig into the manufacturer's specification and look for the word "linearity" which is the accuracy of the balance. Depending on the manufacturer the linearity is ± 2d, 3d or some low cost Chinese made balances it could be 4d or 5d. Using the Sartorius Entris64-1S the linearity is stated as ± 2 divisions. The Entris64-1S increments in 0.002 grain divisions so the linearity is ± 0.004 grains. These manufacturer specs are performed by the manufacturer and done in controlled environments (temperature & humidity controlled, no static electricity issues, no radio frequency interference, perfectly stable air so there are no drafts). You have to have faith the manufacturer is honest in their testing and we have seen over and over again the no name brands stated specs do not correspond to the performance of the balance. Since testing is done in ideal environments you really can't expect the same performance and let's just say if the manufacturer states ±2d with your environment you'll get ±4d.
A kernel of Hodgon H4350 weighs between 0.020 - 0.030 grains per kernel. Each kernel weight varies. So for the Sartorius Entris64-1S I like to say when you have your balance level, balance warmed up for at least 30 minutes, in a stable environment realistically you'll expect to have accuracy to 0.008 grains (0.002gn x 4d = ±0.008gn). Now if you purchased a milligram balance the readability and linearity would be 10 times less of an analytical balance so the best performance you could expect is 0.08 grains. If a kernel weighs between 0.020 - 0.030 grains per kernel there is no way a milligram balance can deliver the consistent weighing results the competition benchrest shooting is looking for which is knowing each round of ammunition has the same amount of powder. Having ammo with an extra kernel or short a kernel will result in the bullet being high or low of the target's bullseye.
The RCBS10-10 mechanical beam scale finest graduation is 0.1 grains. The large poise increments in 10 grain divisions, the cylindrical micrometer poise has graduation to 0.1 grains and uses a gauge that increments in 1 grain divisions. One 360 degree rotation of the micrometer poise yield 1 grain.
If we say the average weight of a kernel of H4350 is 0.025 grains then 4 kernels weigh 0.1 grains, which is the best readability the RCBS 10-10 offers. It is not the accuracy since you are moving parts, friction points and the agate bearing the fulcrum pivots on wears. We'll use the Omega 2 Speed Powder Trickler from Daddy Products available at www.omegapowdertrickler.com and we will dispense one kernel at a time to see how many kernels it takes to move the beam of the 10-10. Now watch closely as I drop one kernel while also looking at the beam pointer. I am going to press the BLACK button on the Omega Trickler and drop 1, 2, 3, 4 5 kernels. You'll notice it takes 4 to 5 kernels to see the beam even move. If you are doing any competition shooting and weighing powder with the 10-10 and other shooters are using an analytical balance you can see you are at a great disadvantage.
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