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TESTO 570 made in Germany, ready for R1234yf NEW refrigerant, it has per-programmed pressure-temperature chart and calculates subcooling and superheat, about $700 and the EasyKool software for computer interface and data recording another $280. This is a LAB grade piece of equipment, vary accurate, it dose elevation compensation, temperature compensation for temperature sensors and vacuum. Attachments: #1: two clamp probes $55. for taking superheat and subcooling measurements,#2: NTC air probe $120. #3: AMP clamp probe $229. to measure current draw from the Prius electric compressor. #4: vacuum rated hose 1/4" $47. each you need three. #5: 3/8 vacuum rated hose $41. #6: water proof NTC for flat surface $108. ( This was the cheaper one, the gauge I want starts at $1899. ) SELECTABLE FUNCTIONS: 1# Pressure/Temperature 2# Tightness test 3# Evacuation 4# Charging 5# Pressure/compressor 6# Current 7# Efficiency calc. and it's programmed for R744 ( Co2 ) USA is a little behind the times. R123, R600, R717, Flammable and Toxic refrigerants. I have 608 CLASS 1, CLASS 2 and CLASS 3. to handle high PSI and low PSI TOXIC and FLAMMABLE refrigerants, These are close book test. Not like the automotive open book test for EPA 609 refrigerant license ( what a joke )