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Cheap replacement bulbs for the Signoscope T1 Watermark detector.
I originally stated that I had found inexpensive replacement bulbs at www.grainger.com. They sell a 6.3 volt bulb that I have found to be an acceptable substitute for the bulbs that are sold as replacements and cost $5.76 for a package of ten.
The one problem with Grainger is that they are geared toward serving the needs of business not the needs of the individual. I tried to buy type 243 bulbs for my Radio Shack 30X Illuminated Microscope and I could not complete the transaction because Grainger was looking for information that I could not provide like business account numbers etc.
Eventually I found a website that deals only in light bulbs. The site is www.1000bulbs.com and not only did I find the bulbs for my microscope (#IND-0243) I found the same bulbs for my Signoscope too (#IND-0040) that were at Grainger. The real kicker is that they are even cheaper at 1000bulbs.com - only $2.04 for a package of 10! The IND-0040 bulbs form 1000bulbs.com have all the same characteristics as the bulbs from Grainger but with out the checkout hassles.
Unfortunately www.1000bulbs.com no longer have the IND-0243 bulds in stock but the IND-0040 bulbs are still available.
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