This offering is for SW UV Ultraviolet Indicators - 8mm fused quartz - Rare Earth Phosphor filled - Ultra Red Glow.  These glow INTENSELY RUBY RED COLOR in response to the presense of 253.7nm Ultraviolet Luminance as produced by Wood's Lamps used in examination rooms of Dermatologists and Veterinarians.  These are a Very Low Cost alternative to purchasing SW UV Meters which can cost from $400 - $1200 or more.  They glow in proportion to the SW UV present and are filled with Rare Earth Phosphor Yttrium Vanadate with 2% Europium and sealed on the ends with epoxy.  You will not find these easily anywhere else on the internet or medical marketplace.  Acceptable forms of payment include either Personal/Business Checks or Money Orders or MoneyGram or Western Union or Paypal ($2.50 surcharge).  Shipping for any quantity to the 50 states is $3.50 and to Canada, Europe, U.K. and Australasia is $5.00 non-insured or $18.50 Registered U.S. Airmail Insured at buyer's option.  These COULD save your EYESIGHT!  - d.k.a./scientificos