Heathkit Model IM-32 no probes see at http://img.photobucket.com/albums/v618/skyrider28/IMG_4399.jpg Micronta model 22-025 see at http://img.photobucket.com/albums/v618/skyrider28/IMG_4402.jpg Your choice $15.00 each plus shipping Worked when I checked them several years ago. Been in storage. Thanx Lloyd KK7IZ kk7iz at cox.net 480-620-7145