Durometer according ISO 7619-1 for determining the Shore surface hardness of foams, steering wheels and inner linings of motor vehicles with hardness < 20 Shore A 
Features
The spring loaded outer ring assures a constant measuring pressure and eliminates false readings due to difference between operators Working face 44.5 mm ? Application range < 20 Shore A units Flat bottom prevent tilting and improves the measuring accuracy Adjustable Min./Max. indicator marks to highlight working range of the hardness tester High repeatability
Operation
For measuring the hardness, the spring-loaded outer ring of the housing is pressed downwards until the edge of the ring meets the colored marking on the housing. This ensures a constant pressure and prevents measuring errors.
General:
The principle used to measure shore hardness is based on measuring the resistance force of the penetration of a pin into the test material under a known spring load. The amount of penetration is converted to hardness reading on a scale with 100 shore units.
As the depth of indentation is max. 2.5 mm the test material has to have a minimum thickness of 6 mm. If thickness is less stack some samples til you reach the required thickness. 
Dimensions
Complete Kit
Hardness tester with carrying case, Certificate of Compliance with the order 2.1 according EN 10204 free of charge, operating instructions 
Specifications
| Indentor | Ball, 5 mm diameter (R=2.5mm) | | Depth of indentation | 0 - 2.5 mm | | Typical applications | Foams, steering wheels and inner linings of motor vehicles | | Accuracy | ± 1 hardness unit | | Application range | < 20 Shore A | | Standard | ISO 7619-1 | | Measuring spring force | 0.55 - 8.065 N | | Test pressure* | Approx. 12.5 N | | Scale diameter | 54 mm | | Display range | 0 - 100 Shore AO units | | Working face | 44.5 mm ? = 15.5 cm2 | | Base plate | 44.5 mm ? | | Weight, net (gross) | Approx. 300 g (500 g) | | Dimensions | 50 x 60 x 110 mm (LxWxH) |
* Spring load of outer ring to create constant pressure
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