Charnwood Instruments We are a leader in calibration services based in Coalville, Leicestershire, with the capability to supply you with unrivalled coverage of calibration services throughout the UK. We have decades of experience in the calibration industry and additionally have the ability to provide extensive service, supply and maintenance for all your calibration needs through our network within the ESG group with multiple UK branches. These partner relationships enable us to expand our service list which includes sales, rental, equipment calibration, test and measuring equipment supply & repair and servicing.