The Magnaflux MT-21 Series is upgradable in the field, without returning the gauge to the factory. The MT-21B basic model accepts all transducers and is capable of making accurate thickness readings on a variety of materials with access to only one side of the product. The M-21 model adds features such as gain adjust, vibrating and illuminated alarms, and transducer wear alert that informs the user when transducer replacement is needed. The M-21DL deluxe model combines the features of the MT-21B and MT-21 with a 50,000–reading flexible datalogger and B-Scan and Echo-to-Echo features.

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