Secure This Site on Your Home Computer
The whole current Circuit Detective site can be yours for offline viewing (html, no ads, 4MB). For $10 you can download a .zip file containing the site (not recommended for smartphones or some tablets). This button lets you pay by card or by PayPal:
When PayPal says, "Thanks for your order," you must click on "Return to The Circuit Detective (or 'Merchant')" to download.