Mass
45 g
Assembled, board and gasket included. Lighter than the head it screws into, so it does not move the centre of gravity enough to notice.
Fit
44 / 46 / 48
Millimetre heads, single and double, tested on 11 models across three manufacturers. The list ships with the units.
Install
5 min
Threaded by hand at the sink. No tool, no adhesive, nothing drilled, and it comes back off the same way.
Specifications.
Dimensions, materials, electronics and regulatory status. Bench measurements are labelled as bench.
Dimensions38.9 mm collar
Collar38.9 mm, threaded M40 × 0.75, 4.5 mm engagement.
Height17.2 mm below the back plate, 11.4 mm above it.
Mass45 g assembled, board and gasket included.
ClearanceDiaphragm plane unchanged, so the acoustic load on the skin stays the head's own.
Materials and finishprinted, then machined
HousingPA12, laser sintered. Collar in anodised aluminium, graphite.
SealingSilicone face gasket, 60 Shore A, plus an O-ring groove at the collar.
IngressIPX4 once closed, bench tested on three assemblies.
CleaningAlcohol wipes on the outer surfaces. Not autoclavable.
Electronicsone channel, one board
ChannelOne, 20 Hz to 2 kHz, 48 kHz sample rate, 16 bit.
MicrophonesReference capsule plus the signal capsule. The difference is what carries the wall estimate.
Battery70 mAh, a week of clinic use, charged over USB-C.
StorageOn the phone, not on the insert. Nothing leaves the room unless someone exports it.
Regulatory statusprototype
StatusPrototype. Not a medical device, not cleared, not for diagnosis.
EvidenceSimulation and bench, on 111 recordings. No patient data yet.
NextA pilot with 20 to 40 echo-booked patients, at a site that wants the answer either way.