| Inbound Relationships | Type | Active | Source | Characteristic | Refinability | Group | 
| Gustatory test stick | Is a | True | Tester | Inferred relationship | Some |  | 
| Olfactory test stick | Is a | True | Tester | Inferred relationship | Some |  | 
| Physical reference standard | Is a | True | Tester | Inferred relationship | Some |  | 
| Electrical conductivity meter | Is a | True | Tester | Inferred relationship | Some |  | 
| Haemodialysis dialysate electrical conductivity meter | Is a | False | Tester | Inferred relationship | Some |  | 
| Electrical impedance meter | Is a | False | Tester | Inferred relationship | Some |  | 
| Light meter | Is a | False | Tester | Inferred relationship | Some |  | 
| Cardiac pulse generator test magnet | Is a | False | Tester | Inferred relationship | Some |  | 
| Pipette calibrator | Is a | True | Tester | Inferred relationship | Some |  | 
| Lung simulator | Is a | True | Tester | Inferred relationship | Some |  | 
| Noninvasive blood pressure simulator | Is a | True | Tester | Inferred relationship | Some |  | 
| Decibel meter | Is a | False | Tester | Inferred relationship | Some |  | 
| Anaesthesia vaporiser tester | Is a | True | Tester | Inferred relationship | Some |  | 
| Circuit breaker tester | Is a | True | Tester | Inferred relationship | Some |  | 
| External defibrillator tester | Is a | True | Tester | Inferred relationship | Some |  | 
| Hemodialysis dialysate tester | Is a | True | Tester | Inferred relationship | Some |  | 
| Oscilloscope | Is a | True | Tester | Inferred relationship | Some |  | 
| Electrical safety tester | Is a | True | Tester | Inferred relationship | Some |  | 
| Electrosurgical diathermy system tester | Is a | True | Tester | Inferred relationship | Some |  | 
| Endoscope leak tester, electrical | Is a | True | Tester | Inferred relationship | Some |  | 
| Function generator | Is a | False | Tester | Inferred relationship | Some |  | 
| Hearing aid tester | Is a | True | Tester | Inferred relationship | Some |  | 
| Electrical heating pad system tester | Is a | True | Tester | Inferred relationship | Some |  | 
| Infusion pump tester | Is a | True | Tester | Inferred relationship | Some |  | 
| Leakage current tester | Is a | True | Tester | Inferred relationship | Some |  | 
| Probe tester | Is a | True | Tester | Inferred relationship | Some |  | 
| Pulse oximeter tester | Is a | True | Tester | Inferred relationship | Some |  | 
| Short-wave diathermy treatment system tester | Is a | True | Tester | Inferred relationship | Some |  | 
| Body temperature simulator | Is a | False | Tester | Inferred relationship | Some |  | 
| Transistor tester | Is a | True | Tester | Inferred relationship | Some |  | 
| Therapeutic ultrasound tester | Is a | True | Tester | Inferred relationship | Some |  | 
| X-ray film processor tester | Is a | True | Tester | Inferred relationship | Some |  | 
| Radiographic film view box magazine tester | Is a | True | Tester | Inferred relationship | Some |  | 
| ECG electrode tester | Is a | True | Tester | Inferred relationship | Some |  | 
| Line cord resistance tester | Is a | True | Tester | Inferred relationship | Some |  | 
| Power line receptacle tester, electromechanical | Is a | True | Tester | Inferred relationship | Some |  | 
| Power line receptacle tester, electrical | Is a | True | Tester | Inferred relationship | Some |  | 
| Power line receptacle tester, mechanical | Is a | True | Tester | Inferred relationship | Some |  | 
| Endoscope leak tester, mechanical | Is a | True | Tester | Inferred relationship | Some |  | 
| Video test pattern generator | Is a | True | Tester | Inferred relationship | Some |  | 
| Audiometric/hearing aid tester | Is a | True | Tester | Inferred relationship | Some |  | 
| Radiographic test pattern | Is a | True | Tester | Inferred relationship | Some |  | 
| Hemodialysis conductivity standard solution | Is a | False | Tester | Inferred relationship | Some |  | 
| Pressure transducer simulator | Is a | True | Tester | Inferred relationship | Some |  | 
| Invasive blood pressure simulator | Is a | True | Tester | Inferred relationship | Some |  | 
| Invasive blood pressure transducer simulator | Is a | False | Tester | Inferred relationship | Some |  | 
| Ultrasonic surgical system handpiece/generator tester | Is a | True | Tester | Inferred relationship | Some |  | 
| Electrosurgical diathermy/ultrasonic surgical generator tester interface | Is a | False | Tester | Inferred relationship | Some |  | 
| Anesthesia/respiratory gas flowmeter tester | Is a | True | Tester | Inferred relationship | Some |  | 
| Pressure meter, line-powered | Is a | False | Tester | Inferred relationship | Some |  | 
| Electronic sphygmomanometer tester | Is a | True | Tester | Inferred relationship | Some |  | 
| Ultraviolet germicidal light radiometer | Is a | False | Tester | Inferred relationship | Some |  | 
| Heart valve prosthesis tester | Is a | True | Tester | Inferred relationship | Some |  | 
| Gas analyser tester | Is a | True | Tester | Inferred relationship | Some |  | 
| Laser fibre microscope | Is a | False | Tester | Inferred relationship | Some |  | 
| Retinal prosthesis system radio-frequency coil | Is a | False | Tester | Inferred relationship | Some |  | 
| Anemometer | Is a | False | Tester | Inferred relationship | Some |  | 
| Syringe pump displacement tester | Is a | True | Tester | Inferred relationship | Some |  | 
| Syringe pump occlusion pressure tester, digital | Is a | True | Tester | Inferred relationship | Some |  | 
| Syringe pump occlusion pressure tester, analogue | Is a | True | Tester | Inferred relationship | Some |  | 
| Anaesthesia system leakage tester | Is a | True | Tester | Inferred relationship | Some |  | 
| Electrical breakout box | Is a | True | Tester | Inferred relationship | Some |  | 
| Heater/cooler system tester kit | Is a | False | Tester | Inferred relationship | Some |  | 
| Blanket/pad infant phototherapy unit tester | Is a | True | Tester | Inferred relationship | Some |  | 
| Laser exposure time tester | Is a | True | Tester | Inferred relationship | Some |  | 
| Pressure meter, battery-powered | Is a | False | Tester | Inferred relationship | Some |  | 
| Calibration gas cylinder regulator | Is a | False | Tester | Inferred relationship | Some |  | 
| Pneumatic line tester, battery-powered | Is a | True | Tester | Inferred relationship | Some |  | 
| Pneumatic line tester, line-powered | Is a | True | Tester | Inferred relationship | Some |  | 
| Ventilator tester, line-powered | Is a | True | Tester | Inferred relationship | Some |  | 
| Ventilator test system | Is a | False | Tester | Inferred relationship | Some |  | 
| Operating table system tester | Is a | True | Tester | Inferred relationship | Some |  | 
| Laser beam tester | Is a | True | Tester | Inferred relationship | Some |  | 
| Microwave system quality assurance device | Is a | True | Tester | Inferred relationship | Some |  | 
| Shoe electrical conductivity tester | Is a | True | Tester | Inferred relationship | Some |  | 
| Multi-purpose digital medical camera calibrator | Is a | True | Tester | Inferred relationship | Some |  | 
| Floor/equipment/cloth electrical conductivity tester | Is a | True | Tester | Inferred relationship | Some |  | 
| Laser beam imaging media | Is a | True | Tester | Inferred relationship | Some |  | 
| Battery tester | Is a | True | Tester | Inferred relationship | Some |  | 
| Break-force limb muscle tester | Is a | True | Tester | Inferred relationship | Some |  | 
| Hydraulic flow tester | Is a | True | Tester | Inferred relationship | Some |  |