Prisma Digital Tire Gauge and Stopwatch

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  • Regular price $329.99
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This is hands down the number one tire pressure gauge on the market for both go kart and car racers!

Now with a built in stopwatch, accurately check and save your tire pressures and time four of your competitors all in one device.

Keep track of both hot and cold tire pressures for multiple sessions as well as lap times for four drivers with 9 individual split times!


 TIMER mode
  • Time and date
  • Outdoor air temperature – in °C or °F
  • Menu languages – ITA – ENG – FRA
  • Automatically backlit display with light sensor
  • Belt clip
  • IP55
Stopwatch mode
  • Mode A – Absolute Split time
  • Mode I – Incremental Split time

Stored data
For each session, the following data is stored:

  • Time and date of the session
  • Outdoor air temperature
  • Statistics of the 3 Best Times per lap for each driver and their differences
  • Storage of 30 laps for each driver and their intervals
  • Up to 9 intervals per lap
  • 7 Timer sessions
  • 50 Digital gauge sessions


By activating the PRESSURE SHOT function through the menu, the tool stores the tire pressures when HOT without having to press any buttons. This feature allows you to save the pressures immediately, preventing the tires from cooling and obtaining unrealistic values.

Pressure Accuracy CLASS: 0.1%
  • Maximum error at 5 BAR: +/- 0.005 BAR — (0.072 PSI)
  • Maximum error at 1 BAR: +/- 0.001 BAR — (0.014 PSI)
  • The HPM4X digital gauge does not require calibration. The internal microprocessor calibrates the tool every time it is turned on to ensure correct readings at 100%.
Pressure and Temperature
  • Pressure measurement units in BAR and PSI
  • Temperature measurement units in CELSIUS and FAHRENHEIT
Set the direction of saving data depending on the circuit
  • Clockwise
  • Counterclockwise
  • You can set whether to start from the front or rear wheels