1. NFC613-14/C1               Gauge for checking impossiblity of single-pole insertion of plugs
(6A/16A)
2. NFC613-14/C2               Gauges for size of entry holes for plug pins (5.3mm/5.8mm)
3. NFC613-14/C3A.B.C     Gauges for distance to point of first contact
( 5.75/5.0/5.25mm, 6A; 5.45/5.60/5.75mm, 16A)
4. NFC613-14/C4A.B.C     Gauges for minimum opening contact tubes
(3.94mm, 300/150g; 3.80mm, 400/200g; 4.60mm, 400/200g)
5. NFC613-14/C5               Gauge for acceptance of two-pole plugs (6A/16A)
6. NFC613-14/C6               Gauge for maximum opening of contact tubes(16A)
7. NFC613-14/C7A.B         Gauge for pin spacing(6A/16A)