These Spring Scales feature a clear plastic case so students can observe the mechanism. Scales include an aluminum front panel that can be moved up or down for zero adjustment, metal pointer, suspension ring, and load hook. Calibrated in Grams and Newtons. Additional Info: These spring scales feature a clear plastic case so students can observe the mechanism. Scales include an aluminum front panel that can be moved up or down for zero adjustment, metal pointer, suspension ring, and load hook. Calibrated in grams & newtons. Package Size(L x W x H): 8 X 2 X 1.75 (IN) Categories: Spring Scales, Standard HTS Code: 8423.81.0050 UNSPSC: 4.11115e+007 Country Of Origin: INDIA