This Newman Tension Meter is a shock proof, bi-directional tension meter.  It has all stainless steel hardened gears with eight sapphire jeweled bearings, shatterproof crystal and a heavy-duty aluminum housing for protection.  If any repairs are needed it modular construction makes repairs easy and inexpensive.  It has a direct reading in N/cm with a + - 1% accuracy.  It is also available in kilograms/meter.