Please be advised that from 27th October 2021, production of Alter71 has ended


A metal detector with the capabilities demanded by advanced users, but provided with preloaded settings which make it ideal for beginners also.


The Alter 71 detector can not only be used as a static detector for very deep low frequency work, but just as effectively as a rapid, dynamic detector for locating small non-ferrous objects using high frequencies.


The flexibility of the detector is enhanced further by the option of dual mode, using the benefits of motion and non-motion mode simultaneously.


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Frequency adjustable between 4.4kHz and 18.4kHz in steps of 0.2kHz
Automatic Ground Balance
Proper Ground Balance information
7 factory programs + 4 users
Modes of work: Motion with discrimination, All metal, Dual
Sensitivity - 90 levels
Discrimination: range 0-120 or -90 +90
Notch - 120 notches
Hot rock adjustment
Reaction speed (ground filters) - 8 levels
Short signal masking - 7 levels
Threshold level
Threshold tone
Threshold sensitivity (All metal channel)
Audio gain
Iron volume
6 factory preset sound profiles + 3 user programmable sound profiles
ID type (range 0-120 or -90 +90)
Display information hold time
ID gain
Built-in wireless audio transmitter
Weight with batteries (6 AA cells) - 1630 g
2 years from date of sale
Alter71 detector with 28cm DD search coil, protective covers, find bag and sew-on badge

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