240 260 270 240 260 270 Compare user features Portable ✔ ✔ ✔ PC connectivity functionality (USB) ✔ ✔ ✔ NOAH compatible ✔ ✔ ✔ Thermal printer output ✔ ✔ ✔ Internal memory ✔ ✔ ✔ Air conduction functionality ✔ ✔ ✔ Bone conduction functionality ✔ ✔ ✔ Masking (AC + BC) ✔ ✔ ✔ Speech audiometry (live) - ✔ ✔ Speech audiometry (recorded) - ✔ ✔ Sound field output - ✔ ✔ Binaural speech - ✔ ✔ Threshold retention function ✔ ✔ ✔ Automatic test (AC) ✔ - - Talk forward ✔ ✔ ✔ Talk back - ✔ ✔ Monitor function - ✔ ✔ Optional insert earphones ✔ ✔ ✔ Battery power function / total portability ✔ - - Carry case supplied ✔ ✔ ✔ Patient response switch supplied ✔ ✔ ✔ Mains power adaptor supplied ✔ ✔ ✔ Compare technical features Frequency range (AC) 125-8KHz 125-8KHz 125-8KHz Frequency range (BC) 250-8KHz 250-8KHz 250-8KHz Attenuation range (AC) -10 to 120 max -10 to 120 max -10 to 120 max Attenuation range (BC) -10 to 70 max -10 to 70 max -10 to 70 max Output level range (soundfield) Up to 90dB Up to 90dB Insert masking output 90dBHL max 250-4KHz 90dBHL max 250-4KHz 90dBHL max 250-4KHz Attenuation step size (dBHL) 5 5 5/2.5/1 Pure tone signal ✔ ✔ ✔ Warble tone signal ✔ ✔ ✔ Continous signal - ✔ ✔ Pulsed signal ✔ ✔ ✔ Stenger test - ✔ ✔ ABLB test - ✔ ✔ SISI test - - ✔ Dimensions (mm) 270 x 165 x 60 270 x 165 x 60 355 x 230 x 100 Weight 735 g 830 g 1.54 kg External PSU ✔ ✔ ✔ Optional battery power ✔ - -