... various styles of tire gauge 2. pen gauge, dial gauge, digital gauge, depth gauge, inflator gauge, truck gauge,indicator cap SMT5216 ... To inflator, squeeze handle.Release to check tire pressure Notes:For accuracy, check pressure when tires are cold. Pressure increases ... must be worn when using this gauge.SMT8118A-indicator capSuitable for any tyre from 20-422psiInstructions:1. Unscrew existing valve ...