Hello together, I am looking for an air pressure tester that I can rely on. I change quite a lot of wheelsets for family and friends. I fill the tires with a Makita battery compressor. To adjust/check the air pressure I currently use a digital air pressure tester that does not always deliver reliable values. Therefore, I have to check with every car to the gas station afterwards. Does anyone know a quotation for an air pressure tester of the calibrated or at least calibrated delivered? Unfortunately, I found nothing to do with it.