The SDT TIGHTChecker is an ultrasound solution designed to verify the tightness of closed volumes. FREE SHIPPING*

Everything Leaks…

The SDT TIGHTChecker is an ultrasound solution designed to verify the tightness of closed volumes.



  • Focused

    Tightness integrity is an issue that plagues every industry. SDT TIGHTChecker is an ultrasound solution focused on pinpointing leaks in any volume. Cars, trains, airplanes, buildings, cleanrooms… TIGHTChecker checks them all.

  • Simple

    TIGHTChecker is so easy to use. Simply open the box, position the T-SONIC1, seal the volume and listen for leaks. TIGHTChecker’s crystal-clear sound and vibrant color display pinpoints even the smallest leaks.

  • Affordable

    With so many things to test, TIGHTChecker is in high demand. It’s low entry cost, versatility, and SDT quality make it the most affordable solution for testing everything that leaks. And everything leaks.

Contact us for more information.

*FREE ground shipping in the continental US.

SDT270 Ultrasound tool(Opens in a new browser tab)

Tech Specs

Function Ultrasound measurement device
Display 160×128 pixel Color OLED
Keyboard 5 function keys
Typical measurement range -6 to 99.9 dBμV (reference 0 dB = 1 μV)
Resolution 0.1 digits
Measurement bandwidth 35 to 42 kHz
Signal amplification +30 (built-in sensor gain) dB to +102 dB by step of 6 dB
RMS period time 250 milliseconds (main screen) / 3 sec (bar graph)
Sampling frequency 64 kHz
ADC Resolution 12 bit
Minimum sensitivity -31dB (@40 kHz, 0 dB-1 V/µbar)
Operating temperature range -10 to +50 °C |14 to 122°F
IP rating IP42
Standards EN 61326-1:2013, EN 55011:2016 + A1:2017, EN 61000-4-2:2009, EN 61000-4-3:2006 + A1:2008 + IS1:2009 +A2:2010
Housing material ABS
Dimensions housing 158 x 59 x 38,5 mm |6.22” x 2.32” x 1.51”
Flexible rod length (Removable sensor) 445 mm |17.51”
Weight 350g | 12.35 oz
Battery/Utility connector USB Mini-B 5-pin
Battery 2 AA batteries
Autonomy 7 hours
Operable with SDT provided head set only
Maximum audio output (protection) +83dB SPL with SDT headset
Headset 25dB NRR Peltor HQ headset
Warranty Lifetime



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