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Refrigerant identifier is a must have diagnostic tool for any Hybrid repair shop or any shop preforming any a/c service what so ever.... Prius or any car dose not like contaminated refrigerant, whether it be from another refrigerant or air. I can not even keep track or count how many times I have been called into a repair shop or have received a customers car and it just had the a/c serviced , some times two or three time by the same shop because they did not even know they were the ones that are contaminating the refrigerant. If you as a service shop just take in one car with R22 or any other higher pressure gas and mix it into your " Recovery/Recycle/Recharge" machine (R/R/R) it will be added to you existing 30lb. or 50lb. recycled tank that you will be injecting into every car after that car and you will not even know it. You as a shop have just became the STD ( sexily transmitted disease) of our repair industry, as if you carry AIDS or HEPATITIS C with no cure to every car you touch. I have shops tell or the TECH say I have changed the expansion valve, then I changed the compressor, some times twice because it was making noise, I replace the condenser because the Pressure was so high but it did not help, and many other procedures because of misdiagnosis. All because the shop owner was too cheap to buy a refrigerant analyzer or worse yet did not even know they existed or that they were a diagnostic tool. Guess what Mr. or Miss Customer your car was just a guinea pig for that shop to make money off you and you just helped then learn it pay to be cheap at the customers expense. Some times after a few tries they fix it and some times they lose and have to send it to the shop down the road. It's the honest but less knowledgeable shops i feel sorry for, the one that know they made a mistake so they eat the labor loss and parts and not charge the customer. These kind of shops are far and few and are becoming extinct species in this trade. Caution* with refrigerant analyzers you get what you pay for, ok ones start around $1700+ the better one $2200-2500 to $3400. If you have a older one but not too old you can contact the manufacturer to see if they have a program update or a circuit board swap to update to the new R1234yf refrigerant or detect other "SNAP" refrigerants the dumb nice person EPA allow to be made and installed into car causing contamination of refrigerant across the entire united states and venting of refrigerant into the atmosphere. Cars that use PAG oil do not tolerate chlorinated refrigerant (CFC R12/R22/ ect) it brakes down the PAG oil. Neater normal R134a PAG cars or hybrid electric ESTER oil cars work well with air mixed into the refrigerant. Just think all this could have been avoided with the use of a refrigerant analyzer, but that would just be to right, " the simple common sense for a earth worm not to come out into the hot summer sun and try to cross a black top road"!. Warring if a TECH just once taps into the wrong service port or not fallow the instructions that came with the analyzer oil may be pumped (injected) into the unit causing damage NOT covered under warranty!!!. This happened to me twice letting someone else use my analyzer who did have some years of a/c experience. shop owner or TECHs if you are about to buy your first analyzer make sure it's a new one up to date with the SAE standers J2912 HFO-1234yf refrigerant , do not let your self get scammed into buying a old unit not having the ability to test R1234yf refrigerant. A NOTE*** for the PRIUS CUSTOMER do not let any shop that dose not have a refrigerant analyzer preform any a/c service to your Prius!...