Topeak d2 smart head digital pressure gauge topeaks d2 smart head digital pressure gauge is their second generation digital gauge which features a rotating smarthead and works seamlessly with both presta and schrader valves without the need to change parts complete with a precision digital gauge that reads up to 250 psi17 bar this d2 smart head digital pressure gauge is designed for use with tyres suspension forks and rear shock units the lcd display is programmable customise the displa