H/Dry H/Moist H/Wet F/Dry F/Moist F/Wet S/Dry S/Moist S/Wet
Factorm/s 215 200 160 195 155 110 95 75 65
msreading Depthformula(m/s)*ms*1.5(1.5isderivedbydividemsreadinginhalfandmultby3ft/m)
9 2.9 2.7 2.2 2.6 2.1 1.5 1.3 1.0 0.9
10 3.2 3.0 2.4 2.9 2.3 1.7 1.4 1.1 1.0
15 4.8 4.5 3.6 4.4 3.5 2.5 2.1 1.7 1.5
20 6.5 6.0 4.8 5.9 4.7 3.3 2.9 2.3 2.0
25 8.1 7.5 6.0 7.3 5.8 4.1 3.6 2.8 2.4
30 9.7 9.0 7.2 8.8 7.0 5.0 4.3 3.4 2.9
35 11.3 10.5 8.4 10.2 8.1 5.8 5.0 3.9 3.4
40 12.9 12.0 9.6 11.7 9.3 6.6 5.7 4.5 3.9
45 14.5 13.5 10.8 13.2 10.5 7.4 6.4 5.1 4.4
50 16.1 15.0 12.0 14.6 11.6 8.3 7.1 5.6 4.9
55 17.7 16.5 13.2 16.1 12.8 9.1 7.8 6.2 5.4
60 19.4 18.0 14.4 17.6 14.0 9.9 8.6 6.8 5.9
65 21.0 19.5 15.6 19.0 15.1 10.7 9.3 7.3 6.3
Yellowdenotespotentialneedfordeepmode
Usegreenareatoupdateverticalspeedofsound
Usedeepmodesettingforanythinggreaterthan5feet
Usedeepmodesettingforpipesgreaterthan2"indiameter
"H"surfaceisahardsurfacethatleavenomarkwhenyouplaceyourfootonit.
"F"surfaceisafirmsurfacethatleavesasmallmarkwhenplaceyourfootonit.
"S"surfaceisasoftsurfacethatleavesaobviousdepressioninthesoil.
Adrysurfacehaslittleornomoistureinit
Amoistsurfaceisdamptothetouch
Awetsurfaceisoneyoucanseewaterorismuddy.
Whenconsideringasurfacetypeconsidertheconsistencyofthesurfacethrougoutthedepthbeingtested.
SoilCondition
12
Displaying Results
“MS” Readings
Above each pipe found a Millisecond (MS) Reading is
displayed to the left. This is the time for the signal to travel
from the APL to the object and back. This will assist in
identifying objects at similar depth. Consult the APL Time
Conversion Chart (below) for approximate depths.
Caution: There are no guarantees on accuracy due to
range of soil types.
APL Time Conversion Chart