Measuring spoons inaccuracy?
I am quite perplexe right now?
I have 2 sets of measuring spoons and they dont offer the same volume for the same number of millimeters? If I compare the 1ml (1/4 tea spoon), one set ends up more in the like of an half (2ml or 2.5) of a tea spoon (of 5ml). And when a put two half of tea spoon on a tea spoon it spill up, alot...
So, I dont know what set is accurate. I went to a kitchen store today and me and the clerk we did the same test with sugar on two sets : they did not calibrate the same?!?
Are you aware of this problem and is there a company tha produce accurate measuring spoons?
According to Cook's Illustrated, these are the most accurate measuring spoons and cups they have tested (from 3 reviews in 2008, 2011 and 2012).
Cuisipro Stainless Steel Measuring Spoons Set - Model Number 74-7002
OXO Good Grips Measuring Spoons - Model Number 76081
Wilton Scoop-It Measuring Spoons - Model Number 2103-325
Amco Houseworks Professional Performance 4-Piece (dry) Measuring Cup Set - Model Number 864
Pyrex 2-Cup (liquid) Measuring Cup - Model Number 6001075
To test a digital scale, a U.S. nickel (5-cent coin for non-Americans) weighs exactly 5.00 grams and a U.S. cent (since 1983) weighs exactly 2.50 grams. U.S. Cents 1981 and before weigh 3.11 grams. (In 1982 solid bronze U.S. cents were replaced with copper plated zinc U.S. cents. In 1982 both metal types of U.S. cents were made.)
Canadian coins are lighter. A Canadian 5-cent coin weighs 3.95 grams since 2000. A Canadian 1-cent coin weights 2.35 grams since 2000. Before 2000 coin weights changed several times due to changes in metal content.
After reading this thread, I realized that I've never actually measured any spoon set for accuracy; I always just assumed the better brands were calibrated. I know it's after 3 am and I should be sleeping but I had to check mine. Good thing mrbushy can sleep through all of my late night food related experiments and shenanigans.
Happily, my Progessive set is quite accurate, even the smaller no name set of 1/64 to 1/8 was pretty right on. Now a non-issue, and I can rest easy.
I have assumed that my spoons with deeper bowls were the most accurate (as opposed to the common stamped steel ones). I tested 2 sets, a plastic KitchenAid, and similar shaped steel (Progressive). Both have ml markings as well.
10 Tablespoons of water (15ml) fit into the WonderCup set at 150ml. 3 tsp (5ml) fit into 1 Tablespoon. 4 1/4tsp (marked 1.25ml) fit into 1tsp. This was for both sets, so I am satisfied with their accuracy.
I have two sets of good stainless steel measuring spoons - both measure the same (I'm not using an atomic scale - so we're not talking nanograms here - but pretty darn exact). BUT I needed a tablespoons to measure some veterinary antibiotic and bought a cheap set at the dollar store. Ha. Not even close. The 1/2 teaspoon is about a standard teaspoon and the teaspoon is about the same as the 1/2 teaspoon. The tablespoon measure some random amount - can't remember whether it was more or less but I threw the whole mess out. And to think poor students are equipping their entire kitchens from these places. No wonder they're having problems.
I should be clear that these measuring cups and spoons have a certain "accuracy tolerance", that is the accuracy level is plus/minus a number. As Wattacetii pointed out, even labware have an accuracy tolerance.
I have measured my measuring cup and spoon set against a laboratory balance using water. For example, a tablespoon is about 15 mL, so a tablespoon of water should weigh 15 g. My set is within 10% error. For me, this is acceptable. For others, this is unacceptable. Some sets are better than others.