The TKG-B is a carrying case for Extech's TKG series thickness gauges. The TKG-B is a durable case that will protect your meter. The built in belt clip secures the case to you when meter is not in use.
The TKG-C is a bottle of water soluble coolant solution for use with the TKG series of thickness gauges from Extech. Comes with 2oz. of solution.
Extech's TKG-CAL is a calibration block for the TKG series thickness gauges. The TKG-CAL block increases in thickness with precise measurements on the block itself for comparison with meter being calibrated.