Depending on what the water test is needed for, one can buy test kits on amazon under the names "First Alert" and "Watersafe," or from your local fish-tank shop using any of the test kits from Tetra, Sera, or any other reputable brand.
Some places to find bass tester audio CDs are typical electronic stores. Some such stores are Bose as well as Best Buy. One can also buy such testers online on websites such as Amazon.
One can purchase a gold tester from the Jewelry Tools website, which sells a high quality and well rated tester. The tester is currently being sold for about one hundred and ninety dollars.
A pH tester is used to determine the acidity or alkalinity of a substance. One can purchase a pH tester online at websites including Home Depot, Amazon and Sears.
A power supply test can be purchased online from numerous online retailers such as amazon or ncix. Amazon has a large selection of computer products and offers free shipping.
If someone is looking to purchase a diesel engine compression tester there are a variety of online sources. One can find these testers on sites such as Mercedes Source, Harbor Freight, Amazon or eBay.
There are a number of online locations where one can buy iron filters. For instance, Budget Water, Clean Water Store, and Media Wave all have a selection of iron filters for sale.
One could purchase a portable hardness tester at MCS Direct, and on Amazon. Another place to purchase a portable hardness tester online would be Martrow which offers free shipping in the United States.
You can buy a mini water dispenser from any online site that offers them. You can also buy them from your local water company or hardware store that sells them.
Buy a tester.
Someone can buy water ski equipment online on websites like Amazon or eBay. One can also purchase stuff from internet stores selling sports equipment.
A circuit tester can be purchased at your local hardware store, for example Ace, Home Depot, and Lowe's. If you want to shop for it online, the circuit tester can be bought on the stores' websites along with sites like Amazon and eBay.
I would suggest that you simply attempt to reset the tester and should that fail you can buy another one fairly cheaply from most hardware stores. And I do not think I am insane.