What kind of tool do you use to check transmission fluid on a 2000 Honda Passport?

well...a wrench and you. The 2000 Passports don't have a dipstick to check the Transmission Fluid like you'd expect. To check the transmission fluid you have to get under the vehicle. On the transmission fluid pan there is a fill plug. Take out the fill plug (with the engine off) and using a syringe inject fluid in the hole until is leaks out. Then start the engine let it run a few minutes and put more fluid in until it leaks out again. Put the plug back in and PRESTO! :P