6620 - hydrometer for milk, without therm. 1.020-1.045 in 0.0005 g / ml, (T=20 ° C).Reading above, bandole in the body. Serial number, approved special filling, (330 x 24) mm 

6640 - hydrometer for buttermilk serum according to DIN 10230, without thermometer, 1.014 - 1.030: 0.0002 g / ml, Tp = 20 ° CApprox. (240 x 22) mm

6660 - hydrometer for condensed milk Reading above, without thermometer 1.000 - 1.240: 0.002 g / ml, approved special filling, T = 20 ° C approx (310 x 20) mm

6661 - hydrometer for condensed milk Reading above, without thermometer 1.040 - 1.080: 0.001 g / ml, approved special filling, T = 20 ° C approx (230 x 22) mm

6670 - hydrometer for yoghurt and cocoa drinks Reading above, with thermometer in the body (0 .. + 40) ° C 1.030-1.060: 0.001g / ml, T = 20 ° C, approved special filling approx (240 x 17) mm

6680 - hydrometer for brine / Baumé 0 - 30 / 0.5 ° Bé, T = 15 ° C, approved special filling, without thermometer, approx (240 x 17) mm  

6720 - hydrometer for amyl alcohol, according  DIN 12791, M 100, without thermometer 0.800-0.850: 0.001 g/,l, T=20°C approx (260 x 24) mm

6730 - hydrometer for sulfuric acid DIN 12791, M 50 1.800-1.850: 0.001 g / ml, approved special filling, T=20°C, without thermometer, calibratable 270 mm  

6622-ES - hydrometer for milk, with thermometer  1.020-1.040 in 0.0005 g / ml, (T=20 ° C). T = 20°C, (+10..+40)°C, ca. (320 x 28 )mm Reading above, bandole in the body. Serial number, approved special filling, 

6690 - hydrometer for boiler water, according  DIN 12791, M 100, without thermometer 1,000-1,1000: 0,002 g/,l, T=20°C approx (250 x 20) mm

6731 - hydrometer for sulfuric acid DIN 12791, M 50 1.500-1.550: 0.001 g / ml, approved special filling, T = 20°C, without thermometer, calibratable 270 x 24 mm

6740 - hydrometer for various liquids DIN 12791, M 50 1.000 - 1.050: 0.001 g / ml, approved special filling, T=20°C, without thermometer, calibratable (270 x 24) mm

6741 - hydrometer for various liquids DIN 12791, M 50 1.050 - 1.100: 0.001 g / ml, approved special filling, T=20°C, without thermometer, calibratable (270 x 24) mm

6743 - hydrometer for various liquids DIN 12791, M 50 1.150 - 1.200: 0.001 g / ml, approved special filling, T=20°C, without thermometer, calibratable (270 x 24) mm