Today I purchased a Napa brand, Ultra Pro Sensor Tester.  Model # 95122
For Foreign cars sensors,  They have a domestic #95121.

Turns out they go on sale in Napa's FEB flyer., here in Canada the price
$49.95 for the foreign, $59.95 for the domestic car version..  Reg
$99.ea

I haven't tried it out yet,  but  the claim is for all sensors, I'm in a
hurry, but they list every sensor I've read about in the Bosch fuel
injection book, and it reads out in LED's.  I thought this was worth
passing on, since it could be a handy thing.  The manual give clear
instructions, albeit simple bad or good, kind of thinking.

The 4 sensor leads are good, it even has an additional  lead with a
piercing probe to check without removing the electrical connector.

Sincerely,

Mark Keller
91 Carat WLE