Aren't you able to "recalibrate" the 3/8" unit?

Put a socket on the 1/2" unit that will fit snuggly onto the 3/8" unit, then "torque" 'til both units *CLICK!* at the same time...re-adjusting the 3/8" unit ONLY 'til you reach the same *CLICK!" time-wise...

Then, reset your 1/2" unit to a higher torque setting, adjust the 3/8" unit accordingly, then re-check to see if they "CLICK!" together...and adjust the 3/8" unit for a "finer" tuning, if you will...

If you trust the 1/2" unit, doing this will give you the 2nd torque-wrench you wanted, back.

GL!

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M. G. Burg
'10 - Dakota SXT - Daily Ride / ≈ 172.5K
.'76 - 450SLC - 107.024.12 / < .89.20 K
..'77 - 280E - 123.033.12 / > 128.20 K
...'67 - El Camino - 283ci / > 207.00 K
....'75 - Yamaha - 650XS / < 21.00 K
.....'87 - G20 Sportvan / > 206.00 K
......'85 - 4WINNS 160 I.O. / 140hp
.......'74 - Honda CT70 / Real 125
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“I didn’t really say everything I said.”
. . . . . . . . . . . . . . . . . . ~ Yogi Berra ~