F1 are more precise than M1, with smaller permission error. F1 use 304 stainless steel, M1 use 2cr13 stainless steel. M1 are with adjust bar (at the bottom of the weights), F1 are without. We are suppliers of weighing scales from pocket scale, jewellery carat scale, high precision balance to analytic balance and calibration weights.We also offer a variety of jewellery tools and power inverters, such as diamond tester, gem filter, jewellery loupe, polariscope, dichroscope, spectroscope for jewelers, craftspeople, hobbyists and others. We have been providing our customers with the service and quality they come to expect.
By express, it takes about 5-7 days to arrive. (Eastern Europe, the Middle East, South America takes longer time). Thank you for your understanding. But we will write lower value on package. If there are some unexpected problems happen, we hope to solve the problems with buyers through friendly ways.
Man-made hazards, buyers take full responsibility. 1 We depend on our customers' satisfactory to succeed. Therefore, your feedback is extremely important to us.The item "M1 Grade 1mg-200g Stainless Steel Scale Calibration Weight Kit Set w Certificate" is in sale since Tuesday, March 27, 2018. This item is in the category "Consumer Electronics\Gadgets & Other Electronics\Pocket Digital Scales". The seller is "susanldy" and is located in Shenzhen, . This item can be shipped worldwide.