This is a high quality, accurate, glycerine filled gauge. Glycerine helps protect the gauge from vibration/shock damage and reduces needle chatter as found in traditional dry gauges.
The picture is for illustration purposes only. 
 
Specification:
Stainless Steel Body
Liquid (Glycerine) filled
Dual Display Psi & Bar (0 – 160 Psi / 0 – 11 Bar)
Standard 1/8 Npt Back Entry Male Thread
1.5” Gauge Face