The results showed that objects contacting the hand were judged longer during caloric vestibular stimulation - https://pubmed.ncbi.nlm.nih.gov/22561888/
What is another name for caloric test?
Caloric reflex test - Wikipedia
In medicine, the caloric reflex test (sometimes termed 'vestibular caloric stimulation') is a test of the vestibulo-ocular reflex that involves irrigating cold or warm water or air into the external auditory canal. - https://en.wikipedia.org/wiki/Caloric_reflex_test

While manual testing is always possible, I suppose, I wonder how accurate it can be in determining symmetrische Erregbarkeit, compared to the accuracy (see last example below) of an electronic device.

Might illegible handwriting (Luft read, and typed, as Hand) be the culprit?

"Mithilfe der Luftkalorik können Sie während des kalorischen Tests die horizontalen Bogengänge Ihres Patienten beurteilen."
https://www.interacoustics.com/de/gleichgewichts-diagnostik/...

"Kalorik
Um untersuchen zu können, ob ihr Gleichgewichtsorgan auf Reize antwortet, bieten wir die moderne Luftkalorik an. Diese bietet einen verbesserten Patientenkomfort als die häufig verwendete Spülung mit kaltem und warmem Wasser, da kein Wasser aufgefangen werden muss. Es wird nacheinander warme und kalte Luft in die Ohren geleitet."
https://hno-schlebusch.de/behandlungsspektrum/schwindel

"Das ICS AirCal bietet Ihnen die Flexibilität und den Komfort der Luftkalorik mit der Genauigkeit der Wasserkalorik. Da kein Wasser aufgefangen werden muss, ist der gesamte Spülvorgang für Sie als Anwender einfacher und sowohl für Sie, als auch für den Patienten komfortabler."
http://wiki.gnotometrics.biz/lib/exe/fetch.php?media=wiki:ve...

"Irrigation with the ICS Aircal provides a modern choice for gold standard caloric irrigation. It combines the convenience and patient-comfort of air with the precision of water irrigation so you can do caloric testing with confidence. With no water, the entire irrigation process is easier for you and more pleasant for your patient."
https://natus.com/sensory/ics-aircal/

"AIRSTAR: Air Caloric Irrigators
The AirStar is used for dry thermal examination of the vestibular function by means of air. The AirStar is the most suitable device for caloric testing where water irrigation cannot be performed due to medical reasons or when no water is available in the testing room.
The AirStar air caloric insuflator sets a new standard with its precise temperature and flow rates. Caloric testing is key in the VNG/ENG test battery and air caloric irrigation is a proven and safe method. With the AirStar, the clinician can feel assured that the stimulus delivered to each ear is exactly the same"
https://vngequipment.com/caloric-irrigators/

"The Air Fx caloric irrigator stimulates the horizontal semicircular canal, which is located in the inner ear. It does so by delivering cool or warm air into the external ear canal. This helps to determine if patients with dizziness or balance disorders have a properly functioning inner ear. […]
Precise caloric stimulation
Air Fx delivers a precisely-controlled temperature and flow rate of cool or warm air. It delivers the stimulus by pumping cool or warm air into the external ear canal."

https://www.interacoustics.com/balance-testing-equipment/air...

Note that air caloric/irrigation testing and video HIT can be found referenced together:

"A study of the relationship between the video head impulse test [vHIT - Video-Kopf-Impuls-Test] and air calorics"
https://pubmed.ncbi.nlm.nih.gov/25416853/

"Comparison between caloric and video-head impulse tests in Ménière's disease and vestibular neuritis
Objective: To compare the diagnostic accuracies of air caloric testing with electronystagmography and the vHIT (video-head impulse test). "
https://pubmed.ncbi.nlm.nih.gov/35439091/

What is the caloric test?
The caloric test is a test of the lateral semicircular canals which identifies the degree to which the vestibular system is responsive and determines how symmetric the responses are, between left and right.
By using caloric irrigation, you are stimulating each end organ independently of the other to determine whether one end organ is weaker than the other (asymmetry) or whether neither end organ is providing enough vestibular information to the brain.
https://www.interacoustics.com/balance-testing-equipment/vis...

Chapter 9 - The caloric irrigation test
Abstract
The test of caloric thermal irrigations is one of the first tests for sensitivity of the peripheral vestibular systems dating to the late 1800s.
https://www.sciencedirect.com/science/article/abs/pii/B97804...
https://www.researchgate.net/publication/308082224_The_calor...
https://pubmed.ncbi.nlm.nih.gov/27638067/

Comparison Between the Video Head Impulse Test and Caloric Irrigation During Acute Vertigo
https://link.springer.com/article/10.1007/s12070-022-03123-z

Comparing Ocular Responses to Caloric Irrigation and Electrical Vestibular Stimulation in Vestibular Schwannoma
https://www.frontiersin.org/articles/10.3389/fneur.2019.0118...

Relation of video-head-impulse test and caloric irrigation: a study on the recovery in unilateral vestibular neuritis
:
Alternatively, one can test for vestibular hypofunction with the caloric irrigation test.
https://link.springer.com/article/10.1007/s00405-013-2723-6

Before the caloric irrigation test is performed, a spontaneous nystagmus (SPN) beating can be recorded.
interacoustics.com
Vor dem kalorischen Spültest kann ein Spontannystagmus- (SPN) Schlag aufgezeichnet werden.
interacoustics.de
https://www.linguee.de/englisch-deutsch/uebersetzung/caloric...

One more thing about the term "vestibular"

Vestibulär oder vestibular (lateinisch vestibularis, „zum Vorhof gehörend“, von lateinisch Vestibulum, „Vorhof, Eingang, Vorraum“) steht für:
• das Vestibulum oris (Mundvorhof),
• die Außenseite des Zahnes/der Zähne betreffend;
• den Vestibularapparat betreffend, siehe Gleichgewichtsorgan
https://de.wikipedia.org/wiki/Vestibulär

The vestibular system, in vertebrates, is a sensory system that creates the sense of balance and spatial orientation for the purpose of coordinating movement with balance. Together with the cochlea, a part of the auditory system, it constitutes the labyrinth of the inner ear in most mammals.
https://en.wikipedia.org/wiki/Vestibular_system