Dynabrade 01438 Spring 
Insize ISF-S2000-U, DIGITAL SPRING TESTERS, 450lbf, 6940561961386
$4,639.74
Resolution .05lbf
Range of digital scale 5.9″
Resolution of digital scale .0005″
Disk diameter 4.2″ DIA
Measuring range of force 5%~100% (maximum load)
Peak hold and automatic release function
Set upper and lower limits, red and green indicator and buzzer alarm
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Insize ISF-S10-U, DIGITAL SPRING TESTERS, 2.2lbf, 6940561961294
$3,903.17
Interchangeable Spares
S/A Rear Wire Guide Spring (Includes 981705067000 & 981705068000), 981705260000