Example apparatus are provided to measure characteristics of a test strip. The apparatus may include an accessory for a mobile device to measure characteristics of a test strip. The accessory may include a mobile device adaptor and a test strip adaptor. The mobile device adaptor may include a first sheath and a second sheath coupled to the first sheath to secure the mobile device. The test strip adaptor may be detachably coupled to the mobile device adapter. The test strip adaptor is configured to receive different types of test strips.