Hi Kids: You should always check the expiration date on their containers, be sure to buy from a reputable shop, and quality always surpasses quantity.
That's why, I always make sure I carry my Digital Quality Tester from Fukajika Electronics in Taiwan. Not only does this cyber-age marvel give me a choice of digital or analogue read-out, but the tasteful sound that emanates from the device in over 1000 configurations gives me that ACCURATE crosshair info. that today's consumer demands. Belt-loop & earphones included! That way, I know that I will always have proof-positive of the quality of performer that I choose to measure...Thank You...
bob