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This item is temporarily Out of Stock.
This Gem-A brand of Economy Fluid is similar to the Premium RI Fluid, but rated at an RI value of 1.78 to 1.79, instead of the full 1.81.
The effective difference is that certain Garnets, along with Zircon, may not be measurable using the Economy Fluid, that might instead give a reading with the Premium fluid.
A detailed Instruction Manual comes with this brand - see image above.
This item typically ships within 1 business day.